That's great Larry. Vented rears as well. Excellent.
The 121.61053 says that it is a C-Tek standard rotor.
The 120.61053 says that it is a Premium Rotor - Preferred. I take it that they are better in some way?
You used a front Mustang rotor on the rear and found it to work just fine?
So both numbers are from the FRONT of a Mustang?
Measuring my rotors, the height of the hat from face of disc to mounting surface on the front are 36mm yet the rears are 40mm. This 4mm variation seems a lot and I would have thought that it pushed the centre line of the rotor back 4mm in towards the centre of the car?
Your Mustang rotors (as above) show a height of 58.6mm and a Nom thickness of 21mm, therefore giving a 'hat' height of 37.6mm.
1.6mm higher than stock fronts and 2.4mm lower than stock rears.
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