The 3-bolt thing is pretty common, I've only got 2 sets that actually have all 5 bolts. Howeer, since I've been using them for so long, I can pretty much manufacture them by eye at this point if I ever run out.
I use the 3 bolt ones on random projects, and to test fit wheels after lowering axles under racers, for mock-ups. I never put the 3 bolt hub plates on anything that has more than about 40 HP, or goes faster than 35-40 MPH or will see hard cornering.
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