distributor o-ring

it seems my distr. o-ring is leaking… i dont know what it is (maybe oil), i looked up the part at acuraautomotiveparts.net and the measurements are 26.4X3.1 — my ? is, is this MM or what is it, and what do i need to do to change the o-ring
thanks for your replies…:bored:

I’m not sure about the size, but to change the o-ring, all you have to do is pop out your distributor, remove the old seal, coat the new one with fresh motor oil, and install. Pretty easy. I just did mine.

Oh, if in doubt, just pick one up at the dealer, it’s not that expensive.