Suzuki Club UK

After a very long delay I am finally dumping the Aisin and fitting my SU44 with a Richard Rockwatt modded manifold. My question is: the new mani has a bigger rebate for the t'stat than old one. In all pother espects the new mani seems identical to old one. Original t'stat housing is 52mm O/D seat, new mani is 56.5mm and the rebate in the casting that the t'stat sits in is deeper. So I need a new tstat and gasket(s) but how do I make certain I get the right one so it fits proper?
Any help greatly appreciated, thanks

Don't know if it helps but my gasket is made from cereal packet

Pretty sure the only actual difference between the two thermostats is that one has a rubber seal that fits on it and that's what makes it larger, however the metal part of the stat is the same.

Thanks Scottie, that makes total sense of what I have. Found this (and other similar) and the rubber gasket would make up both the extra diameter and the depth of the bigger rebate/seat:
I shall get this and fingers crossed... next the longer throttle cable

edit p.s. I read here somewhere someone having an issue with temp gauge reading low, mine is the same (about 1/3rd up from cold on the gauge). This may fix that too!!