Shorsey

Jim & Davester, Thanks for the quick replies guys. The 2014 box is a replacement for my different year Sierra so I don't have the original bolts. I was trying to be on the safe side and confirm the size of the bolts. Once I started to dig around online for the replacement bolts nothing ever really confirmed what was compatible for 2014. The surrounding model years used M12 x 1.75 x 45, however all the different sites and their "compatibility check" would not confirm for the 2014 model year. It just made me question myself. It makes sense to go with M12 x 1.75 x 45, but thought I would give it a shot to see if somebody else had come across something different. Thanks again for the responses.

I have a 5'8" box and I am looking for the size of the bed mounting bolts. I can't find the part number for the 2014 GMC Sierra 5'8" box. I can find every other year but 2014 which I need. Everything seems to point at M12x1.75x45 but every online "fit checker" says they are not compatible. Any help would be appreciated. Thanks.