OK, all done and road ready.
This started when upon starting the engine and doing my walk around, I could hear the tensioner pulley beginning to chirp.
Removed the old and found the lack of locating pin issue.
The belt in use was 69in.
Reinstalled the new tensioner and the belt wouldn't reach...Not even close.
New belt of 81in. was tried per some online info. Way too long.
Got a 77in....Quite a bit too long.
I discovered a new to me online resource...Gates FLEET catalog! http://www.gates.com/~/media/files/g...6_lr.pdf?la=en
The correct belt for THIS bus is 74 - 5/8in.
New AC belts were installed also.
All's well in 2K4S-Land.
Next month=1200 mile trip. 2 nights Joshua Tree CA. NP, 4 nights at a friend's in CA., 3 nights at Pleasant Valley CG in Bishop CA., 2 nights at Calico Ghost Town CG and 2 nights at River Island SP AZ. then home.