Dave W,
Bontrager's is not your "typical internet presence". Essentially their website is a "full page newspaper advertisement" type of website. They don't list any specific components, no prices, no ordering information. My "best guess" is that's because they are a "salvage operation" and their inventory changes day to day, depending on what "stuff they pick up" at salvage yards or as surplus from the RV manufacturers from whom they buy "last year's extras"....
Give them a call, (269) 483-7017 or (866) 483-7017. Their primary sales staff is fairly well versed on what they have, where it's located and how much they sell it for. If you can imagine a Big Lots, Harbor Freight, Ace Hardware and an old fashioned general store all rolled up and put in one building next to a loading dock that's adjacent to an RV salvage yard.... Well, that's sort of what Bontrager's would be......
They have definitely NOT entered the "Amazon functionality internet site" category. But they are an excellent source for "hard to find" RV stuff.
ADDED: Take a look at the pictures of their facility and stock located on the RV Parts webpage:
https://bontragers.com/rv-supplies-accessories/ What you'll see are rows and rows of "stuff" some used, some new (out of boxes) some new, some last year's colors, some 10 years old, all "either functional or ready to disassemble to get that little part that broke". Everything from #2 Roberts screws in a barrel to Cummins diesel generators to doors, windows, screens, slide rollers, chairs, cabinet doors, furnace sail switches to "if you can imagine it, it's on the shelf, probably dusty but for sale"..... The photos will give you some idea why there's no "pick a tab internet sales page".....