72 dart swinger rear end

hello i am looking for a 8 1/4 rear end for my 72 swinger. From what i have been reading 67-76 A body rear end will bolt in . Right now i have a 7 1/4 small bolt pattern i am aware the 8 1/4 will be large bolt pattern. looking for one in near Upstate NY in decent shape preferably thanks in advance.