Could anyone point me in the direction of a petrol cap rubber seal? I have not been able to locate one online but if anyone sees one I'd be so grateful for a link. I saw a whole new petrol cap with a seal but it was £60. Cheers!

It was linked in the thread you made about this a month ago...

https://www.fiatcoupeclub.org/forum/ubbthreads.php?ubb=showflat&Number=1622754&page=3

and in that thread Neils Triumph link is now working - £3.90

Those Triumph seals fit Coupes?

They're the right size and material, and that's the important thing.

I just bought a brand new new filler cap - thanks for the tip off anniemac! Dusty sealed box from 1998! It's surprising just how poor they are from new, looks like it's been 'polished' with a Brillo pad and then lacquered! I think I'll keep my refurbished one and just take the seal off the new one..

I have just ordered a petrol cap seal from Johnny at Midland Car Servicing for £10. He said he had a local seal manufacturer/supplier make some up for him. I haven't received it yet though.

I bought some recently, they were off a triumph iirc, perfect fit.
I'll dig out the link.

https://www.triumphparts.gbr.cc/product.php/2368595/

Ordered a couple. Spot on and quick.

Added a couple more orders as well.

I am pleased to say I have now received the replacement seal and it seems to be an exact copy, fits well and very quick to install without dismantling cap. I would recommend this supplier particularly since my MoT tester wanted to fail the car on perished cap seal.

re my post above. This is the link to Midland Car Servicing who do specialise in Fiat Coupe. www.midlandscarservicing.co.uk/

Mine arrived from triumph parts and now the coupe is back from welding and paint, I have test fitted.
Not exactly the same profile as the existing on, but it was a good fit and seems to do the job.
The old one is beginning to look a tad perished in comparison....