Pair of Hope Pro 3 SP Rear End caps Quick Release QR (5033)

DT Swiss Ratchet Freehub Shimano 10/11 speed (Roval) + Quick Release end-cap

DT Swiss Hub set 370 front and rear 11 speed road free hub body center lock disc

DT Swiss 5mm QR End Caps for 2015+ black 180 Hubs

Vintage Bontrager Rear 130mm Freehubs. 24H, Shimano 8-9-10. $8 each.

Bontrager DT240 15mm Axle End Cap Kit Trek p/n 513111 - DT Swiss

Bontrager Rapid Drive 108t Boost Rear Hub 24 Hole - No Driver, 12x148 End Caps

Bontrager Rear Bike Hub 142x12mm Thru Axle 28 Hole 6 Bolt Disc 10sp Shimano i15