What form factor/size is your 5000?

Or it is actually described as Tower in the specs - pic above. 

Thank you. It is the Mini Tower. 

Tower or mini tower is fine.

I chatted with Dell and the advisor said they'd get back to me by email in 12-24 hours.  It takes longer without a service tag.  Don't give me your service tag though as that's private info.

I also tried finding the part on the Dell site including putting the 5000 in the cart to see what would come up.

More digging - Checked out Optiplex 5000 Tower Parts & Upgrades on the Dell site and Dell parts carrier Parts-People.com has nothing for a 5000.

5080 mt and 5000 mt use same 2.5 hdd caddy.  DP/N 54PCC

I'm glad redxps found it because Dell didn't get back to me on it.

Good link

https://www.ebay.com/itm/325738171176