It's the alloy EFI cover, but on a carbed XE crossflow. I bought it really cheap (virtue of buying lotsa gear at once) with the alloy oil cap. Cleaned the crud off inside with paint stripper and posted it, with a full rebuild gasket kit for a carby motor.
Our man checked the cork gasket, and it wouldn't really do the job, so I picked up a factory style thin fibre one, but have kept looking around.
I hope to sight the rubber one tomorrow. Got a lot on this week, in all directions.
Adam.