So I got the Bi dial today and sent a scan to dpd
and also took the watch apart
Bi dial 30.9mm, 0,9mm thick
San Martin
caseback 35.7mm outside, 32.9mm thread
Dial 31mm, 0,3mm thick
Tube thread outside 3.41mm
tube inside 2.4x a bit hard to measure accurately without taking it out
I have asked SM again about the tube. I rechecked their answer and they were taking about the crown
Rehaut ID 29,95mm
I might have a issue with the stem height, so maybe I will need to sand down the dial a bit.
While waiting for the CousinsUK parts,