Are you looking for the 25 hard disk drive hdd or solid state drive ssd upgrade for your existing 35 drive bay setup do you simply need a very low cost 25 adapter cradle for your system the ssd rail is a very low cost and easy to install mounting assembly produced in abs plastic to allow easy fitment of any 25 hdd or ssd drive into your existing 35 drive bay found on server workstation and desktop computers the adapter cradle can also be used for other media types includin