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I could be totally wrong. But if I remember correctly, I used 3/4" inside and 1" outside. That put it 1/8" thick. If I remember right the old o-ring was 3/32" thick. Not a major difference but very notiable when I reinstalled it with new o-ring.
What I did was measure the tube where the o-ring goes and also measured the old o-ring (inside, outside, and thickness). Got one that fit tube snug and a little thicker then old o-ring. The new o-ring also filled the slot for o-ring on tube where the old one had some gap.
I hope this helps.-- Do not forget to drain coolant or you will have a mess.
Last edited by sae; 05-14-2012 at 05:49 PM.