Lucas Type "Wiper" Switch Knob, Austin Healey, Triumph TR2, TR3 part 106689, 3H3096.
This knob is the standard black Bakelite with white "Wiper" lettering for the Lucas PPG1 switch with Lucas pattern hexagonal mounting as fitted Lucas switches and Lucas classic car cables.
Fits on to the standard Lucas 1/4" hexagonal shaft with spring loaded retaining plunger.
Knob diameter 0.7" (17mm), Knob depth 1" (24mm). Note this is a high quality reproduction part.
Note price is per single knob with a number available, inset picture shows side and rear view with 1/4" hexagonal mounting hole. See my eBay shop for other single knobs and the PPG1 headlight and side light switch.
As also fitted to a large range of Classic cars like; Morris, Mini, Austin, Jaguar, Hillman, Triumph, Allard, Armstrong Siddeley, Bristol, Daimler Jensen, MGA, MG Midget, Morris Oxford & Cowley, Rover, Singer, Triumph, Standard, Sprite, Vauxhall, Wolseley etc.
Click on the link to my eBay shop for lots more Triumph, Morris and MG cables and other Classic Car and Motorcycle parts.