MTBF and MTTF figure for T110, R210and R510

We bought a lot of servers included T110, R210 and R510.  All servers are running Windows 2003R2 or Windows 2008R2.  We would like to know the HDD's, CPU, Ram or mother the MTBF and MTTF.  For e.g. the HDD can run 200,000+ hours, we can get this information for future to purchase the new Server.

Thanks a lot