I’ll see if I can find the photos - it wasn’t difficult, just a bit fiddly. The Hyundai seat runners are wider than the Coupe runners, so I made some plates which connected to the Hyundai seats and which then bolted to the Coupe floor mounting points.

Annoyingly, I found that the driver’s and passenger sides of a Coupe are different widths, so the mountings were slightly different from left to right. “Measure twice, drill once” - you should be able to work out how to get them to fit. Just use 5-6mm alloy plate. I used stainless steel and it cost me a fortune in drill bits...