New to Dell. Having a problem searching for a part

Hi there. Bought a used Latitude e5420 and everything is fine except the DVD burner. Thought I may as well make use of a spare HDD I have but am being frustrated in my search for a HDD caddy that will work in this model.

I've tried every variation of the term I can think of and get 0 results here on Dell. Would appreciate any help you could offer.