The Edelbrock throttle body #3828 is 50-state street legal (E.O. Number D-215-75) replacements for late-model 5.0LFord Mustangs. The 65mm size is ideal for stock manifolds, while the 70mm size is ideal for use with our Performer 5.0/ Performer RPM 5.0 intake manifolds and The Total Power Package. The 70mm gained 10hp over stock throttle body. The 75mm is ideal for more radical applications and requires port matching to fit most manifolds. Our 1986-93 throttle bodies must be used with matching EGR Plates. Gaskets are included. Our throttle body spacers/adapters are designed to adapted our 70mm and 75mm throttle bodies to a wide variety of applications. They are 1/2" thick and will require intake port matching.