So he told you to bring the slip yoke in? cork or dustcap seal? It's gonna be hard to fix if you are just trying to fix the slip yoke and not the whole shaft. Being that they say the items are obselete thats most likely true. We scrap inventory over 4 years old or less. Then I think service goes back only 5-10 years I think. You most likely have a 1330 series driveshaft have them build you a new one. Rear correct? I have to build a new shaft for my 85 RC with stuff around the shop. It won't be factory but will be heavy duty.