I'm going to need to call in a favour here. I'm trying to get a member on another board to make some MEP style rear mounts for me and he needs to confirm the measurements of a pair of stock 4gen mounts that he has. I don't have any spares without disassembling the car so if anyone can spare a couple of minutes to measure up one that would be great.

As quoted:

I know this is probably not the right section but I doubt I'd get any traction in the 4th gen section. Thanks guys appreciate it

 

The studs are 90mm on center. I'm in the process of fab-ing a rear brace and that's the diameter I used to place the holes for the studs. I measured it using the method described, with digital calipers; outside width of studs - 8mm, which is the diameter of one stud.

As for the center hole diameter, I am not certain. I do believe that the threaded part of the shock shaft is M8, and based on the pictures I've seen of the bushings, it looks like the lip that rides in the center hole in the mount extends 2mm on each side beyond the width of the hole for the shock stud. An educated guess is 12mm for the diameter of the center hole in the rear mount. Sorry for not being conclusive.