Rattle and rear speakers

[MadMacMcMad]

I have a V8V roaster. I have a really annoying rattle just below where the rear speaker should be behind the passenger.
I pulled off the speaker mesh and no speaker! It's not got the stereo upgrade obviously.
So I need to remove this trim panel and I may as well fit a couple of speakers while I am at it.
So. How do I remove this panel? and if I fit speakers to the connectors available behind the panel, will they work and if so, any recommendations on speaker to use.

Thanks is advance, I am sure someone out there has done it.

[MadMacMcMad]

Thanks paralight.