I want to say I think those were made by Vetterman, and he is enjoying retirement after shifting the exhaust business over to Clint - not sure the vents went along with the deal. We have two of them on the skirt of our -3, and unfortunately, as cool and nicely made as they are, that;’s a horrible position for ventilation - they really suck air out instead of letting it in.
If you find them, consider a better location!
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)