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It wouldn't surprise me at all if they were all identical across the various V7III and earlier models.
Agreed: you should be in a position to check, should you still have a fair quantity of your 7 seat collection.
OEM seats are all made by Shad. One could check part numbers.
There are actual difference in the seats? I dunno but as a person who has had 7 different seats for my two V7 smallblocks I'm going to go with "the OEM seats usually suck".I suspect any differences in size/shape/comfort are going to be strictly cosmetic or measured in RCH's (meaning they will be really tiny).Edit - you say Stone, Special, Rough, but I see a racer in the image. One caveat I'll add is the most comfortable OEM seat I owned was off a Cafe Classic/Racer. It is actually a little different and better.
Are the mentioned seats even interchangeable (without modifications)? I haven't seen any mention of having the same seat pan/base. The popular aftermarket Corbin seat (pan) has been molded for specific bikes, based on the under seat shape of the rear mudguard and electrics/variations.Unless prepared to alter the seat pan and/or transfer foam & cover to another seat, then your original query may not hold answers. Some people seem willing to accept ill fitting, aesthetically challenged compromises, however.
..the nose of the Rough seat is narrower ..