I've made three portapotti covers out of heavy grey vinyl.
Or maybe gray vinyl.  Local fabric store stuff.

Then you have a grey/gray "ottoman" that you can use for
your feet from the swivelled passenger seat or as a step
to get up top, or...well, we know what else you can use it
for....

Anyway, it isn't hard if you have a sewing machine and
it works well.

I'm assuming an '87+ grey/gray interior....

I don't have any pix, but could easily take one tomorrow.

Richard