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Almost certain the small block frame from V7 Classic on up through V7III did not change at the rear seat bracket. I think all those seats work on all the model years. Once you hit the new 850cc frame, the rear frame rail might be splayed out too far (not sure).If my amateur claim is too wishy-washy, AF1 says that V7III seats can be retrofitted to older V7 models.
The only caveat I'll add to the the V7III models with the ones with the chopped rear fender there is a sub-frame that supports the rear fender and tail light assembly. This subframe means a second set of bolts right where the rear seat pan meets the frame. SOME aftermarket seats (my Corbin specifically) are narrow enough that they don't fit over that second set of bolts. I haven't yet tried to find shorter replacements and I'm not 100% certain yet that shorter ones would work.I don't know if any of the OEM seats or any other aftermarket ones would have a problem there too. It's possible some might.
The V7II Stornello was the first to use that fender assist rail, FWIW.
the early v7 seats will not fit the 2021 850v7 we tried at the ga.guzzi rally. I have a 2021 another rider wanted to see if my seat would fit his 2020 spacial no way