Quite some time ago, I picked up a couple of Longhorn 6x6 Wheel Conversion Kits from Blood and Skulls Industry and a couple of Tauroxes to put them on. I finally got around to putting them together, and I'm very happy with the results.
In addition, I don't know if these were a new customer bonus or a packing error or what, but they sent me 8 of their Medium Skulls 1, which are even better quality than the wheels. I scrubbed them a bit just to make sure there'd be no issues with mold release agent, but there was no other cleanup needed. No mold lines, no sprue points, nothing. I've been using them as Blood Tithe tokens and Wound Counters, and have gotten several compliments on them.