Looks like somebodies idea of a custom Rupp. You might be surprised at what's under that vinyl. The Seat should be easy, just unlatch the snaps and see what they left. Hopefully they left the original cover under that custom cover. As for the tank, I don't think it's an original tank under there as it has the red Tecumseh cap which wouldn't fit on a Roadster tank. They had a larger chrome cap. They definitely added the headlight as Roadster 2's had two mounting brackets that mounted with the spring retainer bolts that go through the fork tubes. Looks like they maybe made a custom bracket but I can't tell where it's mounted from the small pictures. But definitely appears to be of the Roadster 2 nature. The chrome rear fender is interesting as I believe they were an accessory. Most had painted rear fenders to match the bike. If you could tell what color the frame had been, you may be able to help figure out which model and year the bike is. Also, if you remove the seat cover, maybe the serial number label is still on the pan. Check that out as well and get back to us.
