Well, if at all possible, I want to avoid using the M-163 kit to build a M-167A1/A2. Too much work from my perspective. I've got stacks of manuals for both systems and an excellently restored "Gate Guard" version of a M-167A2 in front of my armory back in Grand Forks ND. Never thought of getting a Gamma Goat to go along with it! That would be sweet!
I've found two possible sources of kits, one from Hobby Fan - but now way to order, and the second from the link that khkrohn posted. Still no ordering information.
Thanks for all of the replies!