Rails for 2650

We recently purchased 2 Poweredge 2650 servers and specified rails for a non dell rack. The rails we have received do not fit our standard 19" rack, they are too long. The Dell part number of the rails we received is 9K513. I do not know if we have received the correct rails and they just dont fit the rack or if we have been shipped the incorrect rails.

After spending lots of time on the phone to Dell, customer support or Dell tech support are unable find any info on the above part number - amazing. How are we the customers meant to know if Dell dont know themselves.

Can anyone tell me if the above part no is correct for non dell rack rails, and if it is, what can l do to make them fit into our rack.