The shell could be an NA shell, and maybe attempting to re-register back to its original state
I don't see a point since the cost on parts alone would not be worth it, even if you could DIY the transplant

And rewiring it would not be fun

you really need to give more background info on this
so ppl can help
plus, we know you've been trying to sell this, so why not be upfront on a forum that 90% are wrx / subaru owners?