Call me if you want to discuss this further.
Just use wheels designed for an S197 car when installing an IRS. These wheels have plenty of back spacing. Use the same wheel in the front with a spacer. Problem solved.
I was about to order that system when they shut the doors. So I went with the PM3L. After getting such great performance, I purchased the chassis center mount from an '06 Mustang, planned on using a revised version of the EVM axle mount and an aftermarket arm for the 05 up cars. The 86 didn't have enough clearance or floor strength for the chassis mount, so I put that on hold while I played with the PM3L. Ultimately went T/A. But a better fab master than myself could make the 05+ system work.I sorta wish EVOLUTION MOTORSPORTS (EVM) TRI-LINK was still being manufactured.