The easy reminder is that the RHS spacer has the same length as the thick one in front of it as the gearboxplates should run parallel with the RHS bottom frame tube.

BR, Michiel

Another forum member has helped with the information I needed,
Thanks

email (option): Alwyndart@gmail.com

Here are some details for the rear gearbox plate spacers.

No8 left side spacer #66-4602 = 1.6" long.
No9 middle spacer # 15-6240 = 2.5" long.
No10 Right side spacer # 66-4601 = 1.75" long.

Ron

email (option): ronpier@talk21.com