David,
Contact Bill Lawson he should be able to point you in the right direction on these, I should know the answer but for some reason the blinkers are always up on this part, the gaskets to fit I have bought on ebay but before you renew it take it out, take the cover off, plenty of wd40 especially on the pivot pin to free it up and clean it off and that may restore it to full working order.
Geoff
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