So... when digging around under my dash, I found that the three bolts that hold the base of my steering column to the firewall are missing. Just... missing.

Without even one, I can't find out what size they are, and I've searched and searched, without finding any info.

I just need to know what thread/size those bolts are, so I can buy some :/

Such a simple problem but super hard to solve without at least one bolt to find the size with.

 

If memory serves they were either 6mm or 8mm std thread (whatever that is in those sizes) with washer heads and self-forming threads, originally. I think 6 but it's been a long time since I dinked with em.

Pick up acoupla each size off of the card trees at your local parts store and see. They're both real common sizes anyway, you'll probably find a use for the ones that don't fit this particular application sooner or later.

 

Here is the info from the parts catalog:
Screw, SEMS Hex w/ flat washer M6,3x1,81x20 ABPT 6010M Soft WA PZOR
GM OE #12337828