rear brake rotors, Not sure if mine are the right size Options

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So I'm installing new e brake pads and have been having issues getting my rotors back on. The previous owner I believe did a rear brake swap because I have rear disks but the car is an st. What size are the stock gt rotors in the rear? Everything is all centered up and the rotors still aren't sliding on over the ebrake pads. I promise this will be my last post about this

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Thanks for the reply. Yeah, I have the e-brake adjuster all the way back and still no fit. Pads seem to be centered and even if I managed to get the rotor back on over them it would be one tight fit, that's why I'm thinking I have mismatched parts. I think I'm just going to put the old pads back on and just play with the adjustment until the e-brake hold better.