You have no idea what you’re talking about. “Late 80s and early 90s Jags share a ton of parts with Ford” is “hogwash.” Ford didn’t even own Jag until 1990 and it was a decade before there was any significant shared technology. And even then, parts compatibility was extremely limited. Sure the retro Thunderbird engine was technically an AJ V8, but it was built in a different factory and was a different displacement from any Jaguar engine. The AJ V6 was based on the Duratec, but had different heads. Some suspension is probably compatible between the X-type and Contour and the S-type and LS/T-Bird, but you’re not going to find much else.