BeeCool Bikes | SHIMANO TOURNEY Right Thumb Shifter 7-speed
New 7 speed commuter with Shimano SIS index. No noise on stand, shifts smoothly but low clanking sound on road when pedaling in 4th & 5th though not other gears : r/bikewrench
Meghna Shimano Tourney RD-TY300 Bike Rear Derailleur 6/7-Speed for Road and Mountain Bike Direct Mount for Unisex - Walmart.com
Shimano SIS Tourney RD-TY300 6 Or 7 Speed MTB Bicycle Rear Derailleur Bleck New | eBay