Vince, not sure if this will help, I'll try to measure mine tomorrow, notice the oval hole in the rear clam that lets you open the filler cap without opening the rear clam. Rene's car has a similar arrangement and I may be able to get a look at that tomorrow as well.
From memory2" & 2.5" seem a bit small, there are bigger size options here http://www.demon-tweeks.co.uk/motors...uel-filler-cap
Rene, do you still have the invoice for your filler caps? as it may specify the size, to help Vince, regards
Griff
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