Hy stouchton, I wish I was better with the confusilator, but alas I am not, I believe I ran into the problem of the original wheel cylinders being no longer available a long time ago, I did some research and came up with Raybestos part numbers WC19091 and WC19090 these wheel cylinders are the same in all respects as the originals except the port for the hose attachment is at an angle rather than straight out as the original cylinder was. The person who I researched this information for ordered the WC19091 and WC19090 wheel cylinders and installed them with no major problems and as far as I know they are still on his truck performing their function perfectly. The shoe numbers I quoted are a brake parts industry identity number that the industry recognizes, hope that helps.