On the 2.3 motor (M102) they changed the way the shock absorber mounts, comes with a new bracket.
Not sure about the "thread" question, maybe just thread marks from starting the center bolt? The center bolt will just pass right through the center of the tensioner, no threading involved.
Read what I wrote earlier in this thread about how to tell if the tensioner is shot (flat spots on rear of tensioner should "aim" towards the center bolt of the idler pulley)
Gilly
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