I have an 06 2500 SRW that I put Rickson's on. I ordered Centramatics for it but they could only fit the rears, and could not clear the brake calipers on the front no matter which way I turned them and no matter whether I used the straight or offset versions (pairs of both came in the set of 4) I ended up putting a pair of Balance Masters on the front that according to their website are intended to be used on a set of 16. 5" duals. They fit and work perfectly. The part number is MHD-206. So far I am very happy with them.