Mark - Welcome to the forum! Glad you joined.
You got in before I got you the email telling you to go to the New Members Start Here, read the guidelines, and then post an intro thread there. So would you please go do that?
You said "This is my Bullnose", but I don't see a pic. Sometimes this forum isn't the easiest place to post pics, but there are directions for that on the page at Bullnose Forum/Forum FAQ's. EDIT: The pic is now there.
For generic parts, one my go-to places is Rock Auto. Their website has a good catalog. But once I get a part number I shop around as I frequently find the parts cheaper elsewhere.
However, for things like window and door seals, tailgate parts, and other Bullnose parts I go to Jeff's Bronco Graveyard, Dennis Carpenter, and LMC. But you have to do some investigation as some of the parts are better than others.
For instance, aftermarket tailgates are notoriously thin. And many of the vendors have thin door panels. But Dennis Carpenter is said to be making new ones from Ford dies and they are much better - but more expensive.
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI