SJ Bronc
Which flaps are you going with?
Mabbet. They looked good on-line, the install video was straightforward, and Jason Wang (name?), who corresponds on-line regarding their products, was very responsive when people reported that the bolts were showing signs of rust soon after installation. He offered to replace them free of charge, and said that their next shipments would include the upgraded fittings. I messaged him my home address (on the other site), and received a package of new fittings in about a half-month from China.
If you order, try and determine if you have old or newer inventory. Or just go to a hardware store and buy stainless to be sure.
Yeah, we should buy less from China, but that's superb customer service.
Regarding IAG: they're in Maryland, US-built products, and their customer service was on top of keeping me informed about availability and back-order status.