Picked up a set of aluminum wheels / tires off an 09 Duramax for $240 with plenty of tread left! They fit and feel great, the extra width over my stock classic wheels noticeably improves drivability. Looking at buying the correct center caps for the 07-14 wheels, I heard there was a lug nut adapter (?) to run these specific center caps on my classic Duramax. (classic center caps will not work with these updated wheels, although both sets of wheels are 8x6.5). Does anyone know what's needed, if anything, to run the updated caps? thank you