i was wondering if there are any after market panels to replace the one in the very back by the tail lights aka the spare tire cover and the cubby hole

 

^ Unfortunately no....You have to hunt those down. By scouring wrecking yards. Or looking on various for sale websites. (craigslist.org, ebay.com, also Datsun and Nissan websites.) Just Google, or Yahoo. And you should find a bunch of them.

If your cubby cardboard part isn't too bad. You could have it recovered. As for the spare tire panel. Those can be one of the hardest interior parts to find. Also depending on the color, also makes a difference. Good luck to you.

 

i might just end up fabbing something i can put speakers in
if anyone has ever done it please let me know

 

Yes it's been done

 

You mean to tell me, in the 30 years of existence for the 280zx, someone has actually modified one!?