I used
A&M Soffseal
Part Fits Description Measure Price
FD7147 73-79 FULL SIZE FORD PICKUP 78-79 BRONCO WINDOW CHANNEL KIT SET 141.3
FD9010 73-79 FORD (F150-F700) BRONCO PICKUP DOOR WEATHERSTRIPS PR 83.7
FD9364 73-79 FULL SIZE FORD PICKUP 78-79 BRONCO PICKUP WINDOW WEATHERSTRIPS SET 86.4
Good stuff! - their on-line search isn't up-to-modern standards though
also:
B&W
TAILGATE RELATED PARTS 1978-79
D8TZ-9840700-A Tailgate Assembly 1978-79 700.00 ea
D8TZ-9841018-A Upper Tailgate Moulding w/clips 1978-79 30.00 ea
D8TZ-9841018-B Lower Tailgate Moulding w/clips 1978-79 30.00 ea
D3TZ-00407A12-B Upper and Lower Tailgate Moulding Clip Plastic takes 14 1978-79 2.00 ea
D8TZ-9841608-A Tailgate Seal - COMING SOON 1978-79
D8TZ-9841610-A Tailgate Outside at Belt Seal 1978-79 55.00 ea
D8TZ-9841616-A Tailgate Upper Corner Seal - RH 1978-79 18.95 ea
D8TZ-9841617-A Tailgate Upper Corner Seal - LH 1978-79 18.95 ea
D8TZ-9842072-A Tailgate Inside at Belt Seal 1978-79 39.95 ea
D8TZ-98422A36-A Back Window Upper Glass Run 1978-79 40.00 ea
E1TZ-98422A20-A Back Window Lower Side Run L or R 1978-79 45.00 ea
387392-S Back Window Glass Lower Glass Bumpers 1978-79 12.00 pr.
D8TZ-9843000-A Tailgate Hinge - RH 1978-79 85.00 ea
D8TZ-9843001-A Tailgate Hinge - LH 1978-79 85.00 ea
D8TZ-984430A30-A Tailgate Counter Balance Torsion Bar Center Bracket 1978-96 15.00 ea
D8TZ-98431C62-A Tailgate Latch Release Handle 1978-79 67.00 ea
D8TZ-98431C63-A Tailgate Latch Release Handle Stop Bumper 1978-79 1.00 ea
D8TZ-9843732-A Tailgate Scuff Plate 1978-96 40.00 ea
388016-S Tailgate Latch Release Handle Rod Grommet 1978-79 2.00 ea
D3TZ-99439A01-A Tailgate Lower Side Bumpers - on Tailgate 1978-79 4.00 pr.
more in their on-line catalog