Philip, Welcome to the forum!
I can understand your desire for a "vintage" Tucker, but I would encourage you to do some research before buying a Tucker, or other brand of Sno-Cat for that matter.
I've never owned a steel tracked Tucker, so take what I say with a (large) grain of salt. The Tuckers with pontoons and steel grousers use a special flanged bearing at each end of each grouser. Those bearings are no longer available from Tucker and there are roughly 120 grousers. Double that for the number of bearings and you're up to 240.
IIRC Cook's Equipment in Vermont had some reproduction bearings a few years ago for $40-$50 each. Now it's highly unlikely you would need to replace them all, but it does put things in perspective cost-wise if you need to replace some.
There are a few businesses that specialize in selling Sno-Cats. I personally have bought two from forum member Sno Trans. I think it's fair to say he's well respected and a stand-up guy. I can recommend him. Here's a link to his website:
http://www.snotrans.com/
Sno Trans (Bill Guthrie) is a very "connected" guy so even if he doesn't have what you are looking for in his inventory he may know where one is.
The last thought I'd leave you with is transportation, while seemingly expensive, is cheaper in the long run than buying a local machine that needs a lot of repairs.
Good Luck and again... Welcome
On edit:
I noticed SnoTrans beat me to it while I was composing a reply.
After posting I went to snotrans.com just for fun and saw that they do have a Tucker of the vintage you're looking for.
As you may (or may not) be aware Tucker made different cab configurations. The two door version is the most common, but in my opinion the least desirable.
I like the four door cabs the best (and they sell for a premium over the two door models), but of course you need to evaluate what suits your needs.
