Jason at Tischer believes the button now comes with the gasket.
Here is my amended parts list:
Hex nut, 07147172628
Hex nut, M8, 07119921104
Rear window key button with micro switch AND GASKET?, 61319200673
WAVE WASHER, 07119904115 $0.09
This assumes the wiper spindle is still useable. It looked like the threads were good enough after I removed/destroyed the old button. Some wire brushing will probably help. I am definitely going to apply anti-seize to everything during assembly to minimize future corrosion.
Last edited by teamdfl; 09-24-2012 at 10:35 AM.