If you don't have an armrest, get that first. Next thing I got was these rubber mats, the weathertech ones are just too big and too much rubber for Ca.
These basic rubber mats are cheaper and they hold up much better than the oem cloth crap mats the car came with. I started wearing through my cloth mats near the throttle within 6 months, those rubber ones have held up since 2014.
Oh I also got this little plastic insert with the 86 logo to go in that strange vacant emblem spot below the shifter. It looks totally OEM if you ask me which is what I gravitate towards.