I found the ISO plug on a BMW harness. The BMW harness has both a ISO-A and ISO-B connector.

Well, the project is complete and works wonderfully. I used an inline noise filter from Peripheral Interface Components. It's PNF-12 here: http://peripheralelectronics.com/2002/noise_control.asp
It seems to work well.

Thanks again to all that contributed to this thread and made it possible for me to enjoy my Empeg again.

Elon