Bob, the last one is a Power Plus self Propelled from 77-79, if you look back
HERE theres all the stuff on it we worked out.
The Series 80 model I mentioned I would keep for you, I still have sitting at the back of my shed waiting to come along on the trip, so if you use the drive system of one, and the engine and chassis of the other, you should end up with a whole one.
Blumbly is also collecting the auto drives, and to be hones, he may have more intrest in no.2 as I am limiting my collection to the G3 era ones, to save space, while he is collecting all 4, he has 1, 2 and 4, and i have 1 (and only want one and 2) if you do decide to trade those two above, that would give me the 2 i am after and Blumbly all 4, completing both collections.