Repair Parts List Manual for the Twin City 17-28 (formerly 12-20) Tractors. It would be hard to find a nicer original than this! ALSO INCLUDED is the 16 page parts price list, as pictured. Manual number R730C It has 138 pages. International Buyers – Please Note. If you are interested in Tractors & Farm or Construction Equipment, please check out my store & other auctions!