I know that the pad mates up to the back rotor. I have my new front rotors along with all my brake pads but the ECS back rotors are not estimated to arrive till Nov 8th. I was wondering if I could just use my pads for the back and not be overaggressive when I bed them into the old rotors. The pads are a ceramic Kevlar compound. I found back rotors through Adams Rotors but they are $100 more than the ECS slotted cross drilled and will still take two to three weeks to get to MI. So even if I can't reuse my back pads I can still get them shipped to me for free for about $66 so I still would save about $40 plus cost of shipping. I did just change my breaks a few months ago (the front rotor and pads) so those are bedded and new. I'm just upgrading to slotted cross drilled.
Thanks for the help.