Seat bolt size

[Spud2388]

Trying to find out what the thread size is for the rear seats on a 17 1500. I had to add some spacers for my sub box and want to get new ones that are 1" longer if possible. Anybody know? Lowes had nothing that matched so my next stop is the local Fastenal store.

 

[I84885]

Did you ever find the right size bolts needed if so whats and did you locate them at