A long time ago I reported that I had purchased two Cobra Cups, nice seats but unfortunately without a frame. All sorts of other work on other projects came first, but I have now finally taken steps to prepare the chairs for installation. That meant that I had to make frames; I couldn't find anything that made me happy.
My requirements: must be able to install without adjustments (both in the car and under the seat) and not be too expensive.

In the end I decided to build the frames myself. Result of frame 2.0 (we forget about 1.0):

 850 cobra cup 1

With the seat installed it looks like this:

 850 cobra cup 2

And this is what it looks like in my Fiat 850!

 850 cobra cup 3