Your search for "mustang" revealed the following:

Universal Flasher Module - Easy Performance Products

Universal Flasher Module

GM Steering Wheel Switch LED Rebuild Kit - Easy Performance Products

GM Steering Wheel Switch LED Rebuild Kit

Alternator Voltage Booster Module - Easy Performance Products

Alternator Voltage Booster Module

Chevy Chevy II - Nova Sequential LED Taillight Kit ('66-'67) - Easy Performance Products

Chevy Chevy II - Nova Sequential LED Taillight Kit ('66-'67)

Chevy Chevelle Sequential LED Taillight Kit ('66) - Easy Performance Products

Chevy Chevelle Sequential LED Taillight Kit ('66)