Yes the eye bolts were for prisoners(hold their feet down? Cuff the hand cuffs to floor?). Odd that there are 2 on one side, unless that is what 82s had
The black button is for the gun lock(I do believe?). Another version is where smaller buttons are under the dash, one on each side(so that the driver or a riding officer could get the shotgun). 2 of my dads CHP crown vics had them-one had the black button, the other had the 2 smaller buttons under the dash.
I absolutely hate any tan/dark tan/brown (except for the lighter tans) interiors when they are dirty and disgusting(kinda like your carpet). When the interiors are nice and clean I don't have a problem lol.