A-Body 8-3/4" differential with small bolt pattern

I am looking for a small bolt pattern 8-3/4" differential from an A-body to fit on my 70 Dodge Dart, the differential I'm looking for is most often found on Plymouth Dusters with front drum brakes equipped with an 8-3/4" rear axle. Please let me know the condition and price of your axle. Thank you.