I used L brackets underneath my truck to attach my plate, but I had an M1009, M1010, and M1031, a little diff than an M1008.
I would also look into the legality of running vanity or 'period correct' plates, I'm lucky enough that my state law is worded as such that I can run a green USA (Armed Forces in Germany) identification plate with my state issued plate attached under and behind the bumper, still completely visible but because the USA plate is so obvious, you don't look further, and makes it look better, IMO. So, I'd use Plus Nuts on the tailgate to permanently attach a USA identification plate, and mount the state issued plate below, but check your state law. Some states have very specific mounting requirements.
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I haven't run a license plate light and have never had an issue, but YMMV....
They do make license plate light bolts that you can get on Amazon for dirt cheap....
NOT an auction, per site rules...
https://www.amazon.com/CZC-AUTO-Waterproof-Rainproof-Motorcycle/dp/B077Z6WQ6Q/