Shimano RD-6700 Ultegra Rear Derailleur Pulley Bolt
Shimano Ultegra derailleur pulley replacement bolts have beveled head to fit the derailleur cage just right.
Shimano RD-6700 Ultegra Pulley Set
Shimano Ultegra CN-6701 Chain
Shimano CS-6700 Ultegra Bicycle Cassette (10-Speed)
KMC Missing Link 10-speed Reusable 6 Pairs
Park Tool Bottom Bracket Tool - Hollowtech II - BBT-9