Here from DetailJunkees is a 1978-80 photo etch kit with many goodies;
 
Designed to the 1980 promo, measurements seem to match the Trumpeter & 78-79 promos as well, but not yet confirmed for the grille.
Grille
Gauge Bezel with cluster prints
3 Stereo/AC Cluster Options
Custom & Stock Pedals
Keys & Keychains
Speaker Grilles
Exterior Door Handles
C-Pillar Crests
License Plate Frames
Switch Plate
Seat Belt Buckles
Seat Belt Guides (attach to headrest)
Window Cranks
Marker Lights
Trunk Script
C-Pillar Scripts
Interior Door Pull Strap Trim
Interior Door Handles
Dash Bezels
Dash Script
License Plate Prints
*Die-cut Decal Sheet with 2 Gauge Clusters, 3 screen options, 2 stereos and a Nardi horn button.