Agreed. Be careful and pay attention when you order your rebuild kit.
Make sure that in the notes for the kit it lists the letter code on your tab.
I found that Oreilly did not list the codes on their kits, and they ordered me the wrong one for my re-build. Best bet is to look it up for yourself, then call the store with a part number. Or go to Napa and see if you can order it through them.
Helps to have the tag #'s, and the vehicle it came off of if you can.