Theyre 10 x 18" Dynamics rims , sadly only available in 5 stud PCD tho due to the casting .
the centrelock system is a Porsche derived Gallard with a washer bolted to the rim .
Tyres are indeed 245/650x 18" in 004 Compound , they were originally specced for Seat Leon super Coppa cars with 9.5" wide rims .