@VHubbard posted:Don't buy one, hoping to find the other. Example, I have a TMCC powered UP F3 B unit, it was a deal. Finding a dummy A unit or even a matching A unit shell is like finding hens teath.
I'm going to be the nonconformist here.
There's an opposing corollary to this observation, and so far it works quite well for me.
I buy the 'A' units first. Once that's done 'B' units are fairly easy to find, relatively plentiful, and surprisingly low cost, for some reason.
It doesn't work every time but for me it works pretty well -- and more often than not.
Mike