So yeah, I twisted the heads right off all four of them. As a temporary fix, I drilled them out and have them held in with bolts that are too long and stacks of washers, but one side is already starting to make noise. For something more permanent, I was thinking about just drilling through the frame and mounting an appropriately sized grade 8 bolt through the frame, leaving one end long enough to mount the shock to (after removing the bar pin). Any other suggestions?

97 TJ Sahara 4.0, K&N FIPK, 2.5" rancho, 31x10.5 BFG, black rims, tuffy stuff, hi-lift, AA SYE+tom woods CV rear, tera adj. upper rears, centerforce dual-friction, MSD coil/8.5mm, borla cat-back, warn steering skid, slotted rotors+high perf pads.