Jack Flash
Only the mid 80's - you ought to pick up new ones easily at most Autojumbles. Just find out the original donor car from where they came.
I had to source some for my 1970 lotus 7 - originally fitted to early Mk1 Ford escorts, the original switches were made in Italy, and no moulds or original tooling remains to re-manufacture them, with all the classic Ford escort rally boys also avidly looking for them too I had to find original late 60's early 1970's switches. It took over 5 years but I have found all 4!!! and unlike yours mine are also chrome plated around the edge which also wears off in time, exposing the cream plastic which the chrome covered.
Having found 'em all I'm reluctant to fit 'em - hey you work it out.
expect to pay 50P to £150 each!!!, me the most I paid was a fiver
I reckon if I sold 'em on ebay they'd make about £250-£300 for the set of 4 😬