Looks like their are starting to sell aftermarket:
http://phx.corporate-ir.net/phoenix....199&highlight=
My father-in-law has cooling seats, made by this company, in his Lincoln MKX. Definitely a nice addition in Florida - especially if you are wearing a business suit.
The issue would be that you would need to redo the entire seating structure - and the leather would need to be vented. This is a problem in a roadster that may see rain.
I'm installing the waterproof pads from warmseats.com. The guys at ERA are mounting the switches under the dash, not visible, so you just feel for the switch under the dash. This retains the original look.
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Mooch
ERA Registry Map
If you have an ERA and want to be listed, contact me with your info and I'll put it up. The minimum info I need is chassis number and location. The rest is up to you. The most information needed would be: chassis number, body type, city, name, CC nickname, and email address.