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Stock speaker mounting bolt size?

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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

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