2015 freightliner cascadia headlight bolt just turns

Trying to remove the driver side headlight, there are 3 bolts/nuts, every nut i try to remove the bolt just turns with the nut. the shop wants to cut the nut&bolt but can a new bolt be installed?

long story short, my old truck crashed and i kept my custom headlights, i want them on the new truck but i would like to keep the stock ones for backup. so i dont want them cut if it makes the headlights useless.

 

Thanks for the clarification, so they cut the studs and nuts off, I'm guessing I should just get new studs and epoxy the new studs on?

I just want to keep them as backups for if / when my customs blow out