I have one truck that came with factory bucket seats and Kuranosuke's truck (before he sold it) had them as well. I have them in my 77 now. The seat belt latch portion in factory bucket trucks is a little shorter hard plastic shelled, and mounts more up on the middle hump instead of into the floor. The rubber seatback bumper block on the back of the cab wall is also different, it mounts on a metal spacer for bucket seats that makes it sit an inch or so further out from the wall. According to the parts book bucket seats also included the same center console used in automatic trans trucks with a shifter boot, though I've never seen one with it intact.
Mikado options varied slightly from year to year, but here is the basic list:
Three spoke steering wheel similar to some Grant aftermarket wheels, has a leather-like finish
Rear bed corner "Mikado" emblem
Glovebox Mikado emblem
Door switches for dome light, light is larger/brighter
Lighted ashtray (blue lens)
Deluxe door panels with clotch/seat material insert and cover to the bottom of the door
Dual tone horn
Leather-like shifter knob
Carpet
Mikado emblems changed from a japanese "kanji-like" script to a straight font in 1977. The glovebox emblem changed again in 78 or 79, the parts book doesn't note it but I've got one 79 with a stick on emblem and the older ones are stuck on through holes in the glovebox door.
Mighty Mike is a stripe package that came as option code "D88" on series 6 - 8 (77-78 ) trucks. The parts book describes it thus:
Quote:
Sport stripe D88 "Mighty Mike" option consists of a bold multicolored stripe along the door, the length of the body side, on each side of the hood, and across the lower portion of the tailgate.
In 1979 D88 became the "Sport" option with three color stripes going from front to back and across the hood and tailgate. Both options had the name as a sticker on the back bed corner.