TechNews Reel front 'hub series' - 100X15 / 110X20 mm side caps replacement - YouTube
DT Swiss 135mm rear QR end caps for HG cassette *Free Shipping* | eBay
Formula
Powerway M42 Front Hub 100mm X M15 Thru Axle End Caps Black Red Phb-m42 15mm Through Aluminum Alloy 7075 Side Caps Adaptors - Bicycle Hubs - AliExpress
DT Swiss Hub Conversion Kits - Wheelbuilder
EDC FORMULA SP-2048 REAR HUB ENDCAPS - bestbike Andreas Kommer
End caps Formula und CZero Hub - dr. cannondale
DT Swiss XD End Caps for 135mm QR Hubs fits 240 350 440 Rear Axle Conversion Kit 7630024346148 | eBay