G60 steel wheels

Can anyone advise on the size of the wheel bolts for G60 steals,  I need for my 83 Mk1 GTi, had the G60 wheel’s in the garage for years and never fitted them, tried to fit  one today but the bolts from my BBS are to long.. affecting the drums on the rear, never considered that 🤔any links would be much appreciated Thanks 👍

M12x1.5 25mm Radius seat should do it. 

https://www.ebay.co.uk/itm/124869536342?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=zpvF2a0_S7q&sssrc=2349624&ssuid=du1r6JIjQdK&var=&widget_ver=artemis&media=COPY

Thank you much appreciated. 👍