My bro's got an 86 ttop gt, and I've got an 86 gt vert. I don't have any handy interior pics yet of my car. My brother and I are both converting ours to black interior. Since black was never offered in 86, you have 2 choices, 90-93 stuff, or keep it original and use 79-83 black stuff. We both chose to use the original 4 eye stuff because we like that look better.
http://www.foureyedpride.com/phpBB2/viewtopic.php?t=5854&highlight=
that's his progress so far. On his car he has a 79-83 black center console, 79-83 black seat belts, a 79-83 dash (on the 79-82 black dashes, just swap over your frame and it'll bolt up. the 83 dashes are a direct bolt on. ALL ford dashes are painted from the factory from 79-86, so just painting yours is an option) anyhow, he's got new carpet, I got some 90-93 stuff. Hatch panels he has 83 panels....those are the only year that will fit out of ALL years. his pic doesn't show the hatch panels or door panels. + he's still trying to decide on seats.
there are a LOT of little things that come up converting your car to black if you go that route, he wrote a MUST read article if you want to go that route
http://50stangs.com/techarticles/foxbodyinteriorguide.html
in my vert, I'm using some very nice 83 door panels (the 83 ones are closest to the 86 style) some 83 black vert rear 1/4 panels, some 90 carpet, an 83 black dash, a 79-83 black center console, 83 vert rear vinyl black seat, and 90-93 leather front seats, I'm almost finished with my install.
Good luck!!!