[Healeys] light switch knob

[Oudesluys]

Is this the switch you are looking for? If so you can probably use the 
knob of a Landrover windscreen wiper/washer switch.
See:
http://cgi.ebay.co.uk/LAND-ROVER-WIPER-SWITCH-AND-SWITCH-KNOB-SERIES-III-/270771802199?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3f0b41d057
I will have a look in my boxes of old junk and see what I have got. Not 
to hopeful though
Cheers,
Kees Oudesluijs
NL

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