Welcome to the forum!
The best place to get parts depends on what your plans are for the truck. If you are doing a serious restoration you will want NOS (new-old stock) parts as they are usually better than reproduction parts. But if you aren't doing a serious restoration then reproduction parts will probably be what you want and are usually less expensive. Or, if you are just getting it back on the road then a good salvage may be the way to go.
If you want NOS parts you need to know the part number and then you Google for it. Fortunately this site has many of the needed part numbers. The headlight "door" as it is called can be found on the page Exterior/
Exterior Trim And Moulding and on the Grilles, Mouldings, & Headlight Doors tab. But I don't seem to have a page for the grille, so the emblem part # is E7TZ 9842528-A.
Or, if you want to buy reproduction parts, then Jeff's
Bronco Graveyard,
LMC Truck,
Dennis Carpenter, or
NPD.
Hope that helps. But please share more with us about what the plans are for the truck.
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