turn signal gasket

[somewhereinusa]

I have a couple of turnsignal/marker lights that are in quite nice shape, but the rubber gasket is gone. Bluebird no longer stocks it, they want to replace whole assy at over $90 a pop.  The old gasket is a u shaped deal that goes around  the socket assy and is the seal for both the assy and the lens. It's made by a German company R & S. I've not hand any luck with any searches.   Anyone have any suggestions on how to make or find something suitable? I've included some pics including numbers stamped on back and a detail of the gasket.  Thanks in advance.
Dick

[luvrbus]

Buy the foam gasket tape and make those not really hard to do