Redd

Rockauto: Measure twice, cut once.
When they were somewhat new (8? 9?) I tried looking for some parts with them. Found some small problems with their offerings, like genuine AC Delco air conditioning parts for a Japanese car. Ah, no, AC Delco never made those for those cars. Little problems like that. If they offer a genuine OEM part, that's one thing, but their overall "selection" includes many mythological parts. Hopefully that's gotten better, but still...Measure twice, cut once. THEY often have no idea of what they are selling, beyond part numbers.

DennisMitchell

Maybe I shouldn't have recommened since I never used rockauto.com but others on the forum rave about it. Ecstuning is a good source of OEM and OEM equivalent that I have used but not always the cheapest. I got the sense the OP wanted to save money.

Warhead

I have used rockauto for many occasions. The old saying "you get what you pay for" still rings pretty true. I tend to stay with brands I know but I have yet to be burned by misfit parts on unknown brands. most rotors and pads on there will give you the dimensions or them in the pictures as well.

MurrayA4

I have dealt with Rockauto quite a bit in the past, just not for German cars.Their website is good and easy to navigate.Problem is they don't offer a lot of OEM grade parts in a lot of categories brakes for example .The stuff they have isn't "junk" it's decent but If you want to maintain original quality/durability there are better vendors.Napa is a good place, not for their "in house" products but they can sell you Zimmermann Brembo Textar etc.