Ok so im having trouble with my abs light. ive been reading posts and it seems to be that i need a new wheel speed sensor to go on the rear diff of my 2006 stx 4x4. i went to the dealer and they want 80 bucks for this part. anyone know the part number and where i can find it? ive been looking at autozone and pep boys and nothing seems to be coming up. any help would be appreciated.