I think there are two patterns of switch, early & late (nowt like stating the obvious) & I don’t think you can graft one onto the other. Electrically they are identical, if buying a used part do make sure it’s off the same family group.
An early f & a 500 won’t mix.
Again this post starts with “I think” & so someone might like to verify, I have a switch in store which I think is a Mk2 / tf, I can’t check against a Mk1 as my car starts electronically & the key just enables the electronics, the rest of it fell in bits, hence the electronics.
M

Read More...