https://www.ebay.co.uk/itm/MK2-Escor...MAAOSwQG9eHw-j

Okay, its based on a mt75 is probably a better way to describe, much the same as this gearbox on eBay (yet the 6 speed version), I've also seen lots of R&D mt75's use the integral bell housing

no worries, ill likely do what i can to retain the T5 bell housing as id prefer to have that as a easy swap backup. I think it may be possible but need the engine together to start measuring.

Cheers