Wolf Tooth add IS Premium Headsets for Specialized 42mm upper bearing diameters - Bikerumor
FSA Orbit CF-33 1-1/8" + 1-1/4" Campy Integrated Headset - Modern Bike
Park Tool 42mm Head Tube Reamer & Facer Set For Hiddenset Headsets - Aztec Cycles | Stone Mountain, GA
Tebru Headset Top Cap,Stem Headset,42mm/1.7in 52mm/2in Mountain Bike Tapered Straight Tube Fork Headset Bearing Accessory - Walmart.com
Cane Creek Hellbender Bearing - IS42mm - Fanatik Bike Co.
Buy Juscycling Bike External Bearing Headset for 44mm Straight Head Tube with 28.6mm Straight Fork or 1.5 Inch Standard Taper Fork Online in Taiwan. B092QV4B6K
Wolf Tooth Headset Bearing 42mm 36x45 Fits 1 1/8" - Pro Bike Supply