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I am changing the coolant elbow and also want to replace the o-ring on the belt tensioner ( where it fits into the water pump ). I would appreciate some help with the size of for a replacement o-ring . - Thanks

Dont think they sell the o-ring by itself. They give you one with a new pulley in most cases.
Have you tried the dealer?

Yeah not sure if they have OE replacements. Is your current O-ring leaking or damaged?

It is not damaged that I anm aware of but I am going to change a leaking coolant elbow ( between tesioner and LIM) for the last time I hope and want to replace this o-ring too . After all, it is 14 years old and subject to failure form heat . If I cannot find an 0EM o-ring , I would like to know the proper size / I would replace it (HNBR or BunaM o-ring).

RogueSSEi wrote:Yeah not sure if they have OE replacements. Is your current O-ring leaking or damaged?

rkpatt wrote:It is not damaged that I anm aware of but I am going to change a leaking coolant elbow ( between tesioner and LIM) for the last time I hope and want to replace this o-ring too . After all, it is 24 years old and subject to failure form heat . If I cannot find an 0EM o-ring , I would like to know the proper size / I would replace it (HNBR or BunaM o-ring).

Is it for the 99 Olds'?
When I replaced my LIM gasket, I just used some dielectric grease on the o-ring and I haven't seen any problems yet at 138k miles, dunno if this helps you out or changes your perspective, but I've tried to do some searching and I am unable to find that part, just the tensioner bracket that includes a new o-ring, sorry and good luck.

oops typo. I meant 14 tears old.

IIRC you only have one nylon coolant elbow and you are referring to the o-ring that seals the part of the tensioner that goes into the front timing cover.

What I've done in the past was use one of the o-rings that came on the second (lower) nylon coolant elbow for the newer tensioner setup.