Made exactly like the originals from quality steel, these 1965-1967 Mustang Firewall Insulator Fasteners are Metal fasteners are much more dependable and tougher than cheap plastic fasteners available for securing your firewall insulator. To secure, simply push the fastener through the insulator and the firewall. 7 fasteners are included in the set to do one car. Don't forget to replace your deteriorated and beat up Firewall Insulator: Die-Cut (C5ZZ-6501670-A, C5ZZ-6501670-M, C7ZZ- 6501670-A, C7ZZ-6501670-M) molded (MUST-6466-C, MUST-6768-HC)