As far as wiper motors, my 1984 DMC 1450 came with some spare parts. One of which is a NOS wiper motor. The box is labeled "American Bosch Heavy Duty Electric Windshield Wiper" and the part number is WWF 12A13-720S. I don't know what the part number of the wiper arms is or the wiper blades.
Lousy wiper systems are a pet peeve of mine. On Tuckers and Thiokols it seems they were almost an afterthought, rather than someone putting in the effort to produce a system that actually worked well.
Some years ago forum member Cloudcap did a very well done thread on a wiper system upgrade for Imps. I would suggest you go this route rather than try and replicate the factory's less-than-stellar system. Here's a link:
Last year was my first season with a snowcat and I was surprised by the amount of rain and slop I had to slog through. I guess I naively thought that I'd always be floating across powder covered hills under cloudless blue skies. And all of that is OK, but I ended up using my windshield wipers...
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One of my standard suggestions for new Tucker owners is to call the factory with the serial number and ask for the order sheet. Thiokol/DMC/LMC are no longer in business, but you might try Peterson Equipment in Logan, UT (long time snowcat dealer for Thiokol/DMC/LMC and now Pisten Bully). Another option is Dan Gates at Snowcat Service in SLC. I think he may have the records as well.
Good luck!