1975 XJC floor pans
 

Where can I get floor pans for a 1975 XJC? And how easy is it to get parts for this car?

Floor pans and a few other body panels are here:
Jaguar XJ Coupe Body Panels

I got parts from Rock Auto, eBay, Amazon, Summit Racing, NAPA, Welsh Enterprises, shop4autoparts.net, Parts Geek, SNG Barret, Speedway Motors etc.

Basically, parts are where you find them. Husband had little trouble locating everything we needed. One thing's for sure, Google knows where All the parts are for these cars.
(';')

As far as I know real coupe floor pans are no longer available. A few years ago I was able to get series 3 sedan floor pans and had to cut them down a few inches and patch fill the indent for the B pillar.

Speaking as an experienced coupe restorer there is probably more rust than just the floor pans. Have a good look at the rear seat pans, inside the rear quarters, front jack point / kick area and check the rear frame rail.

If you find more tin worm... I would source rust free series 3 parts car that is worn out or has a bad motor and cut it up. This way you will have all the metal you need. 70% of the body is exactly the same or same and improved. I've done exactly this and would do it again. The parts unique to the coupe are either not available or very expensive so they may have to fabbed up.

Thanks, that's exactly what I thought I would hear, that the parts aren't readily available and that I would need to fabricate them. Mainly, because I only heard crickets on "the internets" when I went searching for parts.

Yes you are correct. I've only seen photos but the rear seat pan is gone and the left rear quarter has rust peaking through it right in front of the left rear wheel. There are two basket cases within a hundred miles of me that I could pick up, maybe one of them has good floorboards and footwells.

Well, well body panels are being made. I think this is the same shop that my nephew bought floorboards for his MG from. Thank you!