Valve cover seal sdi rubbers of standing bolts

Moin moin, Just got the valve cover down as the engine is suffing. Only one seal of the standing bolts found. Of course only the seal ordered in advance because I had the lid for the first time and knew nothing about these small seals. Will I buy from VW which ones tomorrow but how do I get them installed? Can I screw the standing bolts in first and then put the lid on it?