I was searching the web for the castrol Edge Supercar oil and came across this offer. I don't know if it's a good deal for you guys in the US.
https://www.welllocker.top/castrol-edge-4l-of-supercar-5w50-fully-synthetic-performance-engine-oil-p-14153.html
Aftermarket wheels ordered
So I've went ahead and have now ordered a set of aftermarket wheels for the GT.
My choice is PUR RS10's in 20x9 and 21x12. This is ½ inch wider than stock with an offset that means the centerline of the wheels will remain unchanged.
The tires will be Michelin Pilot...
These were taylor made, and people would have to make a deal with a local upholstery place in order to something similar.
The original seat foam will be fine underneath