This is the wheel on my truck, it's a 15x5.5 factory unit. The truck came to me sans hubcaps. The diameter of the ring that appears to be for a dog dish cap measures 8-5/8" across, which is the same as a set of dog dishes I have on hand. My other dog dish wheels have three "ears" to hold on the cap, these wheels have four ears. Does that make any difference? If so, what caps fit these wheels? Sorry for the sideways photos, I rotated them upright but it's not working for some reason.