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What do you buy from McMaster?

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.
 
I use them several times a month for misc. maintenence items for the salvage yard I work for and for my hobby shop. Like it was said before, their website ishands down THE best when it comes down to searching and finding the most odd ball stuff (easily at that). I can usually expect to see the item next day if ordered before 2 and the prices aren't insane either.
 
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