Front door speaker mounting brackets Ford Windstar 1998. Need Help.

This is what I have right now on 1998 Ford Windstar. Speakers were never installed. Please see picture below.
I got 5"x7" speakers. How can I install it? Should I just drill holes in metal or there are other options like mounting brackets? Is there a part number? Where would I get something like that?
Thank you

Attachment 26537732

if installing 5x7s in that, I'd just put a bead of silicone on the metal (allow to cure) than put screws through metal. you can make a bracket but not sure if it'd be worth the time.

They don't make some kind of bracket for this? Drilling only?

Quote:

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Originally Posted by dirtyplan

They don't make some kind of bracket for this? Drilling only?

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take a look at your picture and figure out where would a bracket mount with out drilling?

I thought 3 square holes was designed for factory mounting bracket.

I would just use some foam tape to prevent rattle and self tapping sheet metal screws to mount the speakers.

got it. Thank you