patooyee
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I've got the 12-bolt H1's so the o-ring goes on the face of the wheel between the two halves, different from the 8-bolt style where it goes on the shell of the rim. But for the 12-bolts I use 1/4" dia. neoprene and have never had a leak. Part number 12975K35. IIRC they sell it in 10' or 20' lengths. 10' isn't enough and 20' leaves enough left over to make one spare assuming you're doing 4 rims.