Rockauto shows they have drums to fit your application but do not list dimensions.
Yes, you are correct. I have researched them all, none are 13 x 2.5 inch except for the dually drums. Several years back I bought a new set from Rock Auto for my dually rear. Centric brand name. They fit perfectly on the dually but will not work on the single wheel version. The dually drums are quite deep compared to the single wheel version, even though the braking surface is the same. Recently the dually drums are out of stock too...
