Thanks everyone!!!!
I am 100% sure that there is no assembly underneath. I don't recall getting the truck replaced so I don't what happened to the assembly.
THanks for providing part numbers, what is needed, and where to get the stuff.
I asked my brother today if he could dig out the dummy 'A' unit so I can take it to York and possibly get what I need there at one of the parts dealers there. What they hey, there's always a chance!!!
This is such good news - both of us will be excited to get it working again.
As always, thank you - walt