Autozone lists one. Its a special order part which usually takes 2-3 days.

Part Number: 8878
Weight: 17.2 lbs
Warranty: 2 YR
Application: With plain drum

Plain or Finned Drum: Plain
Drum Type: Full cast
Drum Inside Diameter: 10 in.
Height: 89 mm.
Bolt Hole and Circle Diameter: 5 on 4 1/2 in.
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses