what size mcgards for 18" inviot redlines?
 

looking at getting a set of locking nuts but no idea which i need.

thanks.

My standard subaru locknuts fitted mine when I changed to these wheels.

i have no idea what spec the standard locking nuts are, would it be easiest just going to halfrauds and asking them "oi, what size nuts do i need?"

just wondering as the neither the wheels or the tyres are standard rb5 fit. there's offset and all those other things i don't understand :)

Think thats your best plan. Or ask Subaru. Have no idea either unfortunately!