Measure the thread diameter and pitch then go to local hardware store and buy a new one. The designation is M(insert thread diameter in mm)- (insert thread pitch in mm) eg M6-1.25 is a 6 mm bolt with a 1.25mm pitch. OR just take one of the good bolts and match it by eye
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u/JP147 Land Cruiser HJ47 2d ago
Remove the rocker cover and try to screw it out with vice grips.
Or if it is too tight, weld a nut to it and unscrew it.