is it possible to make your own fuel line replacement?
I.E. Are there specifics? size? etc?
this would be for my specific car.

 

That can be a lot of work, especially considering to get all the offsets to match, most lines are 3/8" (9.5mm) for 350-450 hp 6AN fittings. I've never seen any manufacturer give any dimensions for fuel lines. https://www.sngbarratt.com/English/u...assembly/29194

You can use the link to get the part # and look it up to try to find it elsewhere since its discontinued. Places still may carry old/new stock and could show up with a search. Check with Dave here, great guy, he comes up with lotsa old/new stock items...
Jaguar Parts - EverydayXJ