Dell PE2950 Mounting Selection Guide
Unlike some other models, Dell does not make a 2Post Rail Kit for the PE2950. However this does not mean that the PE2950 cannot be installed in a 2Post Relay Rack. To Install a Dell PE2950 in a 2Post Relay Rack, you will need the standard Dell Rail Kit (Dell P/N 310-8194) and an additional 2Post Conversion Kit. This Conversion Kit will allow the mounting of 4Post Rail Kits into 2Post Racks.
Using PE2850 Rails with a PE2950
If you have several PE2850s that you're upgrading to PE2950s, you cannot keep the existing Rails Kits and will have to purchase new rail kits. This is because the PE2850 Rail Kit will not work on the PE2950, so you must purchase new Rail Kits for the PE2950. The Rail Kit for the PE2950 is completely new and improved. There are numerous options available for PE2950 besides the Dell Rail Kit.