does anyone know how long and wide (??) the factory torsion bar bolt is?

i need a replacement bolt but have no idea on the specs.

thanks in advance.

 

anyone?

 

GMFS has a great torsion bar write-up (linked below) but I'm not positive if the bolt/keys on our trucks are the same as fullsize. According to their write-up, the bolt is M12 1.75x60

You can check the usual hardware stores but I had a hard time finding any M12 bolts for a recent project and most that I found were a 1.25 thread pitch. I'm sure a dealer would have them

GM Torsion Bar 401