Given that the 3430 is built like the 3420 , this  [URL] is the original adapter for the 3420 ( there's a pic of an opened system, so you can compare )
I bought a used Dell Precision 3430 SFF machine, and I want to install a 3.5 inch HDD into it. The specifications say that this is a supported configuration, but there are no matching screw holes to install the HDD with. I assume I need some kind of brackets/caddy. I can find the 2.5" caddy online but not the 3.5" caddy. It isn't listed in the parts on Dell's website. Can anyone tell me the part number I need please so I can search for it online, and/or where I can buy it from?
Dell Precision 3430 3.5" HDD caddy