I have the oil drain valve from stahlbus. Highly recommend. both my drain plugs were stripped when I got the car, and I had to timesert them. The problem is, this sticks way down (about 20-30mm) on the oil pan. If you drive over anything that sticks up, you could rip it off ...
If your GS has ABS this tool might just be worth having because without the tool you have to remove that bolt which is nearly impossible to do on bikes with ABS. bg#1002 I have used this tool and it won't work on the cam chain side valves. It is fine on the sparkplug side. ...