Is it also called something else? I'm sure I know the part, just not used to it being called that. What does it being bad cause your coach to do or not do? Having that may help to locate it as well.
Pictures are also very helpful, as we can use them as reference material to help you through this.
With that out of the way, WELCOME!! Yes this is where you belong, with the rest of us that still enjoy our older rigs. It does not have to be shiny and new to be beautiful to us. On that note, how about a few pictures of your rig just to share. You can find (probably way too much) about my rig in the 77 Overland thread, and Capn Dan has a link to pictures of his rig in his signature.
1977 Overland 30' Class A (Felicity)
Dodge 440 in an M500 chassis