This may be the one you are referring to. I had posted it about a year ago. SuEllyn made this from an eve vent that she got from Home Depot for about $1.00. She trimmed it with heavy duty shears and used the ring bezel screws to mount it. This has been on Lucy for two years and still looks good and works very well.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)