I just bought an IBM xSeries eServer 325 (Dual Opteron 246's), but I'm having trouble finding the rail kit for this server. Does anyone know if any rail kit will work on this server, or do I have to buy the IBM one?

My colo's rack has four posts, with square holes; are 19" wide and around 36" deep.

Any suggestions or know of somewhere I can buy a rail kit that'll handle 36" racks?