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Look up " Mopar rear drum 10" 1 3/4 " on eBay .theres a guy selling them on there. They ain't cheep but u can get them.

her ya go : http://www.ebay.com/itm/Mopar-Rear-Brake10-x-1-3-4-5-on-4-NEW-Rear-Drums-ADD-brk-shoes-hdwe-cyls-/380695241704?pt=Motors_Car_Truck_Parts_Accessories&hash=item58a33463e8&vxp=mtr

Semi trucks for the most part have drum brakes still to this day. Unless you plan on doing some serious driving stay with the drums.

I think they make electric vacum pumps and storage cannisters that solve this problem so u can keep your power brakes.

If its the original i would rebuild it.