We have had good experience with both Airlift & American Garage
Door Supply. Although I do remember recently that one of our locals ordered some "what appears to better plastic-stainless rollers" for our Alaskan Polycarbonate OVD
doors. Both being in Minnesota they know first hand the logistics of how brutal winter weather can be on overhead
doors!
Part of the nicety was that Airlift allows us to pre buy & pickup up parts on our way back from Mpls-St. Paul. If we were forced to buy everything just local special order it would have been much more costly. Not sure if both outfits have a discount for any car wash operators but we usually buy in quantity when we buy. We actually store spare polycarbonate panels for unforeseen emergency "in house" replacements regardless of weekend timing or whatever. Also the locals don't do much with "Strapeze" which is the counterweight system that we prefer! The Strapeze Straps can & have been made by a local 3rd generation family shoe repair shop.
I never did buy from "Ultimate" ... I think I did scout them out though some years back. I was not impressed by their infrared heater price & specs ... but that probably was just me.