I recently bought a home built in the late 80's and am trying to find replacements for the baseboard diffusers that have been beaten up over the years. The issue I am running into is I can't find a match to the existing diffusers dimension wise. The current diffusers are 5"Hx2 5/8"Dx18"L. Has anyone seen anything like these or could someone point me in the direction of a replacement? I tried getting a standard 18" triangular diffuser however, they are not deep enough to cover the entire duct and usually they are 4.5" tall. I have seen some taller units but they are at about 5.5"+ which wouldn't work as most of the units have trim running about 1/4" above them.

I have looked at Hart & Cooley, TruAire, Shoemaker etc and am not finding anything that matched.

Any assistance would be appreciated.