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Thank you for your quick reply, however that (7MM6C) is the wrong DVD drive. What I need is the slim DVD and NOT with Blueray.  Why is it that I could order a new 5820 tower with the correct slim optical drive, but nobody with Dell can give me the part number?

Try with 429-ABFY

@mazzinia_​ close, but it is not bluray 

@Xtyklys​ 

That's because tcexperts specifically requested the drive not have blue ray in the post before yours.

@DELL-Cares​ Hello, I'm trying to install a slim line dvd into a Dell T5820 but when I try to slid the dvd drive in there are tangs on the left side of the bracket preventing the drive from sliding in.

@drhicom1​ 

No need to be making duplicate posts.  https://www.dell.com/community/en/conversations/precision-fixed-workstations/dell-precision-5820-tower-internal-dvd-drive-half-height-or-slimline-install/647f8a1af4ccf8a8de9dca81