Here's what I know: Vetter literature shows the Terraplane started Sept of 1979, went through at least 1981, maybe later. The wheel is a Lester wheel. The brake system was made by Airheart, which is still around and sells parts for them.
http://www.airheart-brakes.com/index.html Airheart is located in Minnesota, just a few miles from where I work. You can get a windshield here:
http://www.bikescreen.com/proddetail.asp?prod=VetterTerraplane
As far as parts for mounting, you need 3 pieces: A front and rear pylon and a Trim-Grip. You then need the 3 mounting points for on the bike. I downloaded the mounting instructions from Craig's website.
http://www.craigvetter.com/images/Vetter Fairings/Windjammer-instructions-images/Windjammer_instructions/Terraplane Mounting.pdf It has all nomenclature of the sidecar and how to mount and align it.
http://www.craigvetter.com/images/Vetter Fairings/Windjammer-instructions-images/Windjammer_instructions/Terraplane Manual.pdf Any other parts I was able to buy usually at my local hardware store.
The modifications I made are: Mine was missing the serial number plate, so I replaced with an extra serial plate from a windjammer. I was the able to change the standard 3 prong plug to a 9 pin windjammer plug. I the added a speaker and amp to behind the seat. I added turn signals front and rear. I had I local upholstery recover the seat, which they did to specs. If you didn't know, you would have thought that it was original! I also had the same shop make me a leather cover, which is attached with Velcro to the windshield and side snaps to the body.