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Search O/R pipe install...thousands of suggestions and fixes.
First off...spray it down liberally with some PBblaster. Drink your favorite beverage...or 3.
You will need some extensions...about 12-18 inches if I remember correctly and a 15 or 18MM mid dish socket. You should know the size if yo have removed the other nuts...but a shallow dish socket won't clear the stud and the deep dish will jam on the fenderwell. TGo to Sears and look at the three different dishes...get the one in the middle.