they are a vendor and will have better prices on oem stuff. When i changed out my rear toe arms, i had to cut the bolts there. I used fordparts.com to check what dealers near me had them in stock. I didnt want to wait for parts getting shipped.
yea man best bet just go to the dealer. have them print out a schematic for you of the rear end. then you can pin point to them what bolts you need. i just did the entire rear suspension on an 03 zx3. it cost a good buck, but it was definitely worth it.