What I normally do is to order all the parts I might possibly need for the job.

This way, once you are in there, with it all apart all over the floor, you can decide what to replace without having to wait until the next shipment to complete the job. Plus you have to pay for shipping again. Normally, I realize I need additional parts on Sunday afternoon, when even the local part stores are closed (not that they have what I need EVER). I don't know how things go for you...

I get everything, and return what I don't use. remember to get an RA number.

Nine out of ten times, I end up replacing everything anyway. Rusty old bolts and other parts may not be the best things to rely on for your braking system...