OK, I've been trying to get this to work today.
Because the old mount is so stuffed I've been trying to get the new one to work.
It's a 164 mount (
this) which the internet says is meant to bolt up fine.
I can get it to fit OK if I jack the gearbox up a fair way. I had the same problem as before with the holes not lining up, but the ratchet strap almost did the trick - it allowed me to get one bolt in on each side, but not both.
It almost seems like my drivetrain isn't aligned properly.
The distance between the crossmember and the bracket on the gearbox is 30mm,and that is with the box jacked up - but the new mount is 40mm thick (and even the old one is 35mm thick, presumably it was 40 when new). This makes no sense at all.
Additionally, the threaded shaft coming out of the mount doesn't actually line up with the hole on the crossmember, meaning when I put it in the hole, it stuffs up the alignment of the crossmember:
