Here are some other "how many seats" threads if you want some 2nd opinions, although this may simply serve to add more doubt rather than reduce it
https://forums.frontier.co.uk/showthread.php/326293-Ship-Seat-Count
https://forums.frontier.co.uk/showthread.php/326753-How-many-Crew
I'm 99% certain that Hauler=1, Courier=1 and Python=2 (I've never seen a screenshot of the Python showing 3 seats). I don't currently own those last 2, but I did quite a bit of research on this subject about a month ago. For the ships that I owned (most of them) my list was based on my own use of the Rift walking around the cockpit. For the ships that I did not own or had never owned my sources were various (google images, YT, wikis, blogs etc.). Of course it's possible that FD changed the seat count at some point (see: Cutter), which means that Internet sources are not 100% reliable.
It would be good to get confirmation from other players.
Re the T7, I'm not surprised there is some doubt as there are two "stations" with raised sides at the rear of the cockpit and even in VR it's difficult to see, but I'm fairly certain there are no seats there. If anything there is more likely to be 3 seats than 2, but 3 is very unlikely given that the T7 does not have a fighter hangar. I might be able to check the T7 again in VR this evening.
When beta starts I intend to buy all the ships I don't currently own and check in the Rift. Who knows, FD might add a seat here and there to open up multi-crew to more ships. Will report back.