Lets see those stick shift Magnum cars!

Good grief! Finally found what was tickling my brain.

https://www.forabodiesonly.com/mopa...train-10-5-flywheel-for-fi-magnum-360.470890/
My gut says that both Modern Driveline and American Powertrain are getting the flywheel from the same place. But just a guess.
Science Friction if the paperwork on the wheel from 2020 is correct.

I almost bought one of those lightened steel wheels but I found a company that made mine in aluminum as a prototype. I had a magnum engine wheel with a removable ring, and they removed it and installed it on their aluminum wheel. I've yet to install it. Been saving for an aluminum pressure plate.