Looking at control arms, ball joints, etc. for my '07. Vendors show one number "fits up to 2007 XC70 chassis number 269745". My chassis # is beyond that - near the end of P2 production.

Any idea what changed to make it not compatible with the rest of the production run? Hard to find parts to fit!

edit: it appears that late control arms are supposed to be steel, and the early ones aluminum.