can someone tell me if these are the diff mounts
 

i have has a bit of a rattle going on when accelerating its been coming from the rear of the car so i jacked it up today and found some play in a bush that is situated under a plate with 3 bolts holding it in at the back end of the sill is this the diff stabaliser bush? how much are they and does anyone have a part number its on a 1998 sti

cheers

sounds like a simila thing to what i had but might not be the same, i changed my rear arb bushes and rear drop links as they were worn but it still did it, turned out to be my thread on page one, so have a read and single it out.