Amazon.com : ENBO Shimano Bike Rear Derailleur RD-TX800 7/8 Speed Direct Mount for Mountain Bicycle (Black) : Sports & Outdoors
Amazon.com : Rear Derailleur, Huazu Bike Parts Gear Shifter for Shimano RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles : Sports & Outdoors