need rotors for 7? trans am rear

[1981silverz28]

I just found a deal on a rear out of a 75-78 trans-am with factory disc.I am going to put it under a 1981 Z28. I need rotors and calipers for it .When I call the parts place they say the dont show a listing for them. I want to go back stock for now to get it on the road for the summer,then go drilled and slotted later unless I can find a screaming good deal first.Any help would be great!!

[1976SR71]

Hi,
Your years are off...
I don't think they were factory installed till 79

[1981silverz28]

Thanks ,I wasn't for sure on the year.The guy thats got it, bought it from a guy who got it from a buddy, who got it from a cousin ,etc, etc.I will try to hit the parts store tommorrow.