Just lost one myself !
Found a site by Summit Racing, they have several "push Thru" that look like they will work. I have not taken off a wheel to get exact measurements, but looks like something about 4.25" at base will work, and, they have several that are in that range...
http://www.summitracing.com/parts/AEW-ACC301/
This link os only one of several, you can navigate to find one that may suit you better...
later...