Okay guys, I think I've got it.
(BTW: I am talking strictly diesel here.)
The pilot is the "hole" through which the truck mounted coupler extends. The MT conversion "full pilot" fills that "hole" with the mount for the new MT coupler assembly. This also makes it look more like a real loco, right? Heck, I'll give one a try, what could be bad, huh?
Pete, I have downloaded the MT guide right from their site. I have it in my computer and a printed "hard copy".
I have thoroughly investigated all of my locos. The only one I can't nail down is the OLD Life Like FA2/FB2, which has truck mounted couplers. It says use 1165s on the A unit, but 1016s on the B. We all know they are body mounts, while my B units are deaf-in-Italy truck mounts!
I don't mind spending the money, I just don't want to buy something I can't use! I already have a bag of 2001s and nothing to mount them on!
Marc