Lotus Type 50 - Elan +2
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Production timeline  

Date  Chassis number Change Model   Vehicle Chassis Number
Sep-67 50/0001 First production model Elan +2     The method of identifying a vehicle, whether Component-Built or Fully-Built, is by use of the Vehicle Chassis Number which is comprised of code numbers as shown below. The Vehicle Chassis Number will be found stamped on a plate which is fixed to the left-hand side of the engine bulkhead
  50/0090 Rear brake supply relocated away from exhaust  
50/0100 Straps to secure tool roll and jack added  
50/0150 Boot / wheel arch joint modified   50:  Vehicle Type = Elan +2  
50/0170 New windscreen   1234:  Chassis Number   
50/0178 Revised rear lamp assemblies   As from January, 1970 vehicle identification will be in the following form: 
50/0250 new rear wheel bearing, castings and outboard drive shafts    7001.010001A:  Both chassis and body numbers being the same.   
50/0367 New pedal box and clutch master cylinder spacer   7001:  Represents year and month of manufacture  
50/0445 New headlamp microswitches and mounting bracket   01:  Represents the production batch   
50/0521 additional welding to stiffen chassis at rear    0001:  Represents the unit (chassis) number.
50/0720 Bonnet counterbalance spring deleted   A:  A one letter code denoted the intended market:. 
50/0750 New handbrake pivot     L: UK - N: Federal US model - M: non US export model
50/0795 Modified oil pressure gauge wiring   Chassis Change Points 
Mar-68 50/0857 Federal body with negative earth battery for US market   50/0001: Model introduced  Sep 1967 
Apr-68 50/00929 federal body introduced to all marketsfollow link for more details Federal +2    50/0857: Federalised body to U.S.A Mar 1968 
  50/0994 fuel tankbreather hose / body grommets   50/0929: Federalised body to Other Territories  Apr 1968 
50/1087 Negative earth battery introduced to all other markets   50/1280:   Zenith-Stromberg carburetters in Territories other than Federal  Dec 1968
50/1142 revised handbrake pivot and operating rods   50/1593:  S' type introducedMar  Nov 1969
50/1174 failsafe headlamps on Federal cars   50/2447:  Federal 'S' type introduced  Nov 1969
50/1251 Outer steering column/body gasket introduced       S130 type introduced to U.K.  Jan 1971
Dec-68 50/1280 Stromberg Carbs introduced, with power bulge in bonnet        
  50/1330 Bonnet support frame modified        
50/1333 rear brake dirt shields fitted        
50/1363 New Headlight switch on Federal cars, new headlight lift valve        
50/1367 modified trough between body sides and rear suspension housing    
50/1436 Nyloc bolts replaces Stover or Philidas suspension bolts        
50/1452 New headlight vacuum pod mounting bracket        
50/1460 revised Lotocone rear suspension rubber        
50/1469 revised bodyshell moulding        
50/1480 modified clutch slave cylinder hose and mounting bracket        
50/1510 radiator lowered to increase bonnet clearance        
50/1531 bump limiting spacer on rear suspension introduced        
50/1541 modified exhaust, new front flasher sidelamp assembly        
50/1550 New differential mounting, drive coupling,        
50/1589 revised control box, except on S types        
50/1593 +2 S introduced Elan +2S        
Mar-69 50/1614 Sterring lock introduced        
  50/1645 modified air filter mounting bracket, washer between rubber mounting of differential        
50/1661 new voltage stabiliser, ammeter.        
50/1711 revised boot section moulding        
50/1751 revised indicator mounting clip        
50/1779 location of rear lamps modified.        
50/1831 new radio on UK market cars        
50/1857 Girling MK2B brake servo introduced        
50/1880 New differential mouting bolts        
50/1892 new headlight microswitches and mounting bracket        
50/1907 anti-tilt front seats without headrests for West German market.        
50/1930 new glovebox handle, lock, catch plate        
50/1987 revised front seat belts        
50/2010 revised certification tag on Federal cars.        
50/2121 revised front suspension springs and dampers        
Nov-69 50/2447 Federal +2S introduced Federal +2S        
  50/2526 revised hazard flasher switch        
50/2527 revised windscreen weatherstrip upper and lower mouldings on Federal +2S cars        
Dec-69 50/2536 Last car on 50/xxxx  chassis numbering. New system introduced        
Jan-70 New hazard lights switch, flasher assemblies and direct glazed windscreen on Federal models    improved air trunking, dashboard, roof gutter strip.        
70.02....218 battery condition gauge introduced to non Federal cars        
70.04.?? Boot lid hinge gaskets introduced, revised front brake calipers and pads Introduction of front fog lights.        
70.09... Revised front suspension top.        
70.09...0296L new brake piping.         
70.09...0297L new brake piping. Repositioned aerial braid position.        
70.11.150087M  Up rated drive couplings. Up rated drive couplings.        
Jan-71 Up rated drive couplings.        
  71.01.......0001  +2S 130 with Big Valve engine introduced. Differential casing and mounting upgraded Elan +2S 130/4        
71............ Fuel Evaporative loss control system on Federal cars        
May-72 72.05.....0235M Revised electrical system,  metric piping front brake  connectors on non US export cars         
  72.05.....0272N Fixed back rear seat on US cars. Revised electrical system,  metric front brake piping connectors        
72.05.....0732L Revised electrical system for UK cars        
72.06.....0768L reintroduced metric front brake piping connectors        
Oct-72 72.10.............. Five speed gearbox option offered +2S130/5 Elan +2S 130/5        
 Dec-74 74.12...........1990 Production ends        

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