A/C Fresh Air Door Brackets

[Sheepdip]

I'm trying to get my A/C up to snuff (now that summers over) and ready for next summer but I can't seem to find these 3 brackets for the A/C fresh air duct. Seems LMC has everything but those 3 pcs, I've tried other suppliers catalogs with no success. Maybe make some phone calls tomorrow unless someone here can send me in the right direction. I found this photo on an older posting.

I guess if need be I could reproduce them myself but I'd much rather purchase them.