There is only one part number for the bump stop plate #653330. This for B18 and B20 Amazons. The only difference in that area is with the shock retainer plates. The early ones had a tab which slips over the top of the A-arm and the later ones which are held in place by the bolt. With the early type if the shock rod broke it would drop out along with the plate but the change mostly helps when fitting the rubbers and nut.
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