I mounted a basically brand new Golf 7 seat on it, which fit with just a few washers and some M8 20mm bolts. If you're in Germany and looking for a seat for your simrig, go look on ebay, the guys I got this one from have like 30+ more brand new seats in stock for €160 each!
yeah that's the VR safe space, makes it easier to know whether there's anything within arms reach