New to me at least but it seems that
MacOne Models has a variety of 1:35th and 1:72nd scale detail accessories for models covering a variety of subjects.
The only reason I know about this company is finding a topic at Missing-Lynx about two new resin and metal air-conditioning sets in 1:35th scale:
Air conditioned Set 1
Air conditioned Set 2
Turns out they offer much more than just air-conditioner details :)