So, during the process of replacing my 6x9 speakers on my rear deck, behind the rear seats, i noticed that the wooden board that the speakers are mounted to had been slightly destroyed. There are chunks missing where the screws would have gone through, making a lot of the screws pretty much useless.

My question is:
how easy would it be to pull a newer one from the pick n pull and replace it? From the looks of it, the seatbelt is mounted through it as well.

Or does anyone have any other ideas of how i can modify the rear so i can securely mount my speakers?

I have mounted my speakers directly to the metal from inside the trunk - quite easy with self-tapping sheet metal screws, even though I was a little fancier than that. Let me find the photos.

It is very easy to remove a rear deck from the junk yard but beware - they are ALL trashed. I've never found one that did not at the very least require a recarpeting, and normally required reinforcement of some kind.
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'93 244: 'A' cam 4 deg. advanced, 25/22 sways, custom heim endlinks, poly bushings, and a lot more styling customization than I care to recount.

It looks like whoever previously cut the holes in the deck also cut the sheet metal. I'll take photos if i have a chance, but it looks pretty mangled, which is why i just watned to replace the MDF board that was on the sheet metal.