what I am looking for is the bumpstops that is actually on the shock itself in the rear, is this part sold seperatly or do you have to buy new shocks from ford to get this part, that reason why I ask is that in lowering my car I originally had the stock shocks on the car until they blew out I changed over to KW all around with h&r race springs and noticed that both of the bumpstops were worn/split badly, any info would help, thanks