Stock speaker mounting bolt size?

[508gm1]

Hi everyone.

 

Pretty silly question, I know; but does anyone know the size of the retaining bolt that hold down the stock speakers in gmt-900? I will be changing out my rear speakers shortly, and have re-used the black rectangular speaker mount in the rear doors, dremeled the bracket and attached an 1/8" piece of aluminum to stiffen it and give the new speaker something to mount to. The new setup will make the entire bracket 1/8" thicker, and I would like to know what size and length of bolt to buy. I'm going to do it on the weekend, and I doubt any of the local hardware stores will have metric hardware on hand.

 

Thanks for the help.

 

Cheers, Brendan

[parshal]

That bolt is actually pretty long. It will accommodate an extra 1/8" easily.