So guys, bad news…
The mx5 calipers are a no go on the awd rear axle 
Maybe they could work on the 2wd rear axle, but I couldn’t say for sure.
There is no way of mounting them that wouldn’t result in fouling with the diff, trailing arms or shocks, even if they did fit you would need to do some crazy ass shit to even get a working handbrake.
The 30mm applause calipers will fit, and it looks like that’s the way I’ll go.
I was also disappointed to find that the brackets do in fact need to be modified to fit, the holes are out by a few mm, something I missed when measuring the bolt pattern the other day.
Anyway what feels like a setback is actually a step in the right direction I guess, now I know what will work and what won’t, and what I need to do 
5 Likes