O.K., the RR will be the passenger side rear and the LR will be the driver side rear. I will check to see which ones I have in the garage (storage). I know I have quite a few ... just not exactly which ones.
FYI spray PB blaster or WD40 on the screws and wait till next day to take off place a phillips head srcew driver into the head of the screw and hit it with a hammer this will break years of rust off and help loosen it up to unscrew it... Take your time and dont worry about hitting the screw to hard it will take it just fine. This is the way I have done it for years and it works for me. Others here can also give advice