Reservoir caps

Can anyone recommend a cap with a level switch that will fit a remote reservoir as supplied by Merlin Motorsport for Girling master cylinders?. The cap is 70mm (2 3/4") internal diameter.
Merlin cannot help and I have visited every breakers yard this side of the Thames to find one but no luck.
I remember a couple of guys answered this question a few months ago but I cannot find anything they suggested to fit.

I await in desperate anticipation for any reply.

Regards, Paul.
 
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