Shackle bushings

Hi folks I need help trying to identify without pulling apart..I'm looking at classic industries standard shackles and bushing kit for my 64 barracuda..They show two different sizes 7/8 or 1 inch not sure which one i have and I tried the search threads couldn't find any thing..build date May 64 273 open 7 1/4 differential..I wanted to order parts then start and finish replacement on a weekend..any info would help..Thanks ..Sean