Does anyone know of a company that has manufactured the doors ventshades or rainguards for the RX-8, I have gone to ventshade.com but got no positive answer from them. I want those to ventilate the car when parked and not worry about the rain.

I'm sure someone has some suggestions but probably not in this sub-forum. Try the parts wanted section.
Paul.

go to www.mats.com they show they have them

http://www.weathertech.com/store/vehsearch.asp?make_id=33&year_no=2004&veh_id=1014&item_group_id=4&veh_opt_choice_id=0

theres a company who sell them painted to your cars color those look nice