Triumph Spitfire Gear Knob Cover for Over Drive Switch AAU6867CAP
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Triumph Gear Knob Cover for Over Drive Switch AAU6869
Note the position of Reverse Gear on the Gear Change Layout on this cover.
This may not suit the actual layout of your car if you are not careful
For the separate over drive switch see 520999A
As typically found on :
Triumph Spitfire with Overdrive Gearboxes