I've got an '99 LE too and it would be cool to know what number it was. In addition to the paint and body molding I also believe, from what I was told, was the pony black/silver leather seats, stainless shift knob, silver instrument panel, and pony floormats were features too. Oh!!! and the 17" ponies.
'99 Mustang GT Limited Edition/35th Anniversary
Steeda Tri-Ax Shifter, Ford Racing 4:10 Gears, Moser Axles, Ceramic Brakes, Ford Racing Headers, MagnaFlow Cats, Basani X-Pipe, 40-Series Flowmasters, Bomz CAI(modified), Fully Loaded, Black/Silver Leather, 17" LE Pony Rims, Yokohama S Drive 245-40-17 Tires, Mach 1 Grille Delete, Black Euro Tail Lights, Mach 460 Sound System, Sony Xtreme Head Unit with XM Satellite, Pioneer 3-ways, 2 10" Audiobaun DVC Subs powered by Rockford/Fosgate Amps