Those seats look shat and the harnesses look utter shat.
They're base-mount, so won't be proper shell seats and unless there's a hole for the crutch strap you're going to be limited to 4-point harnesses.
A 6-point cage won't have harness bars, so you'll still have a lot of work to get a harness bar welded into the cage.
I'd go for a grey/silver interior - it'll be hto as hell in a matt black interior in the summer and you only have four tiny little holes in the driver's window.
![rolleyes :rolleyes:](https://www.golfgtiforum.co.uk/Smileys/modern/rolleyes.gif.pagespeed.ce._1-AYLAFoI.gif)