I'm changing my transom assemblies but don't plan to change the inner transom plates. Does anyone know if the plates are interchangeable from now back to the begining, or at least 1992-ish?

I don't there are any differences between the various years.

You should be good, just look at plate by bottom bolts for any cracks. If drive ever hit anything that's where they crack

Thanks for the replies, I was able to get the new assembly mated to existing plate.