I have 30x Seagate Constellation.2 1TB SAS2 2.5" ST91000640SS.
I know they aren't the specific dell part you are looking for nor come with the tray, but they are the literally the same Seagate Constellation.2 1TB SAS2 2.5" ST91000640SS but instead of OEM relabeled, they are first party.
Let me know if you are interested.