We have 4 different rack mounting rails - please follow below summary for the right kit:
CSE-PT26 = mounting rail for SC742, SC942
CSE-PT25 = mounting rail for SC822, SC86x, and SC84x
CSE-PT34 = mounting rail for SC812x, SYS6012 server
CSE-PT08 = mounting rail for SC810, SC811, and SC512x chassis, SYS6010 server