Welcome to PUP ownership, especially with one whose manufacturer is no longer in business.
Good answers above. JLTN_James found a better price on the bunk-end clips than I had previously found as a future replacement source, so I'll be ordering from them.
From my research of parts suppliers, I have found:
(but I think you'll need to deal directly with them via email/phone for Fleetwood-specific parts
A good source of the owners and parts manuals as well as parts is at Ketelsen Campers
I've done business with Ketelsen Campers here in Denver Co., years gone by. They actually had replacement canvas in stock for my old 1976 Coleman when I needed it. Good outfit.
Carson City RV
advertises they have Fleetwood/Coleman parts.
And Daley Camper Sales
advertises repair service and parts.
I have not tried any of the above. I was just building my library of future parts sources.
Most all of anything I've gotten has been from AdventureRV
for just about any of the standard things that need repairs and replacing.
For the awning bag, a local upholstery, boating/sail or canvas shop can replace the zipper. I'm facing that shortly and already got a quote of $150 USD. Grrr.
I made a custom surface for the outdoor grill using laminate countertop. It's made from the same substrate chipboard, so I sealed all exposed edges with outdoor UV-resistant polyurethane. Hopefully it will last several seasons.
You're going to have to get resourceful these days. I've done a few upgrades, mods and replacements already and this is only my first summer with this PUP. But I really love the highwall version over the standard ones, so it is still worth to me versus the previous PUP even though it didn't need much upkeep and repair (probably because I owned it since it was practically new - and pampered it).
Good luck. Let us know how it progresses, and if you find anything in your searching.