Fred, if your deal with G4Captain doesn't work out I wanted to share an idea for selling that isn't the sometimes shady Craigslist and/or Facebook Marketplace route (depends on your area, it's certainly shady as you might imagine here in Vegas). Ebay! I sold some Stinger tires on eBay with local pickup only, took a couple months but worked out well. Looks like you've already been trying for a couple months so might be worth giving eBay a whirl. ALSO, these rims and tires fit more than just the Stinger, so make sure you add specifics and even some other makes/model cars in the listing. This increases your target audience a lot, especially since as you know the Stinger wasn't selling a ton so not a lot of Stinger owners out there in general. Since these are staggered, I would also recommend having the tires remove from the rims and sell them as pairs individually. Then sell the rims as a set of (4).
Hope that helps you or someone reading this in the future as a tip.