Zman,
I hate to say this, but I doubt very seriously that anyone will give you a VIN number. However, you might try the route I took to get my Yerf an off road sticker.
http://www.buggymasters.com/forum/showthread.php?t=4508
In this process the highway patrol inspected my buggy and looked at the numbers that I had stamped. They then recorded them and issued me a Vehicle ID number. I took the ID number to the DMV and they generated a VIN for the buggy. If you try and go this route, I can not stress enough the need for a jig to stamp the numbers. During inspection, they will be looking for any inconsistency. So if your numbers are crooked, spaced unevenly, or not in a straight line, it probably will not fly.
I also recommend that the numbers be stamped on a flat surface. Before I stamped the numbers on the frame, I experimented on some scrap round tubing. I found that I could not get a uniform stamping on the round tube, so I then looked for a flat area. Of course you always want to do practice stamping on scrap metal before you do it on the frame.
Don't tell the Po Po that I gave you this info
