Personally, I've never encountered one missing, at least on housings still attached to the car. Any bit of cloth rolled to fit would suffice. It's just to provide the slightest bit of circulation and to keep dust out. A substitution would be invisible to a concours judge. ron 65,66 __________________________________ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html