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As I bring my recently acquired '06 GMC 3500 box van up to a better state of mechanical condition, I seem unable to find a go-to web forum for general mechanical/electrical/misc info on these vans. Not wanting to clutter up the forum here with a question that's likely already been asked and...

Not sure where else to ask, so am asking here in the hope someone has experience with these things. I need to remove & replace a few of the bolts used on the Supreme service box on my GMC cutaway van. The bolt head looks like a carriage bolt, and the "nut" is some sort of threaded insert that...