i have several sets of wheels and like to switch around every once in a while. the po had put american racing mags on my malibu and had the rear axles drilled for 5 on 5 to match the mags. the rears also had centric rings on them which was ok. i have been getting my QP 9 inch housing ready for a swap this summer. it has speedway 31 spline axles. i have vision aftermarket rallys, factory corvette ralleys,american racing mags and not sure what the other set make is. they all have a different center bores. as it stands now it looks like i'll have to buy custom made centric rings or go lug centric. i had the rotors machined by my friend to fit the new axles. it's a right stuff kit so thats what i'll use. as it stands now the axle center hub is small enough to fit my rims except the factory corvette rallys. i can't believe i'm the only person that has run into this problem so what do most of you do. the rings on the car were off the shelf ones so that was not a problem but the new axle hub is not so it's custom rings or lug centric. btw i like hub centric if i have a choice.