JJBP UDH-inator Kit for Salsa frames using Alternator 1.0, 1.5, and 2.0 plates. 7075-T6 aluminum, black anodized, with laser etching. Includes drive side plate, proper length thru axle for Boost 12x148 frames, plus a thru axle spacer for use with native 12x142 frames. This kit allows for using a UDH only. T-Type derailleurs are not compatible. UDH is NOT included. Chainstay length is non-adjustable (set at maximum for compatible frames). See here for installation instructions: https://www.salsacycles.com/assets/85-000650_INST01.pdf