Grille Delete Frame. This SpeedForm Mach 1 Style Grille Delete Frame is designed to be installed along with SpeedForm's 2-Piece Mach 1 Grille Delete Kit part# 16070. This Grille Delete Frame negates the need to modify your Pony's stock factory grille making installation much easier.High Quality Construction. Manufactured from high quality acrylonitrile butadiene styrene (ABS), this Grille Delete Frame was designed using the original OEM CAD data from to ensure a perfect fit. ABS is an extremely strong material known for its lightweight and superior durability - making it ideal for use on the daily driven Mustangs.Application. This SpeedForm Mach 1 Style Grille Delete Frame is specifically designed to fit the 1999-2004 V6, GT, Bullitt and Mach 1 Mustangs that are installing a 2-Piece Mach 1 Grille Delete Kit.