T2805.51 Campagnolo
The Campagnolo body is suitable for 9 through and including 12 speed Campagnolo cassettes.
T2875.76 SRAM XD-R
The SRAM XD-R body is suitable for 11 and 12 speed SRAM XD and SRAM XD-R cassettes. This version is used for the NEO 2T.
T2805.81 SRAM XD-R
The SRAM XD-R body is suitable for 11 and 12 speed SRAM XD and SRAM XD-R cassettes.