THANKS to all of you who posted...
I ordered the part off eBay, 2 for $110, then contacted my grandson, presented him with a printout of the instructions, let him read same on this site as well as study the pictures.
He really is not mechanically inclined and it took him some time to locate the part and to remove same. All in all, from start to finish, about an hour. After he finished, he said he could do it again in about 5 minutes top.
Truck runs fine and I am really now at ease.
You folks are the best and thanks ever so...
J L Dunn
77 years young.