There is no database column named "Part Number", so I was taking a longshot. I can't tell though, are you saying that worked, or that it didn't?
If not, I'll probably need you to comb some of the database fields to see if you can find the values you're looking for. If you have the SDK loaded, you can do it via that, or it might be easier to use the Database Manager since its loaded with NPM. Go to the server, load it, and click on "Add default server". Go to your database, probably NetPerfMon, and try looking through some tables. I'm using the NCM_Entity_Physical, NCM_NodeProperties and NPM.Nodes (which is now NodesData and NodesSettings) tables. I doubt Dell would be in NCM_Entity_Physical_Juniper, but you might look there if you haven't found it. Otherwise I'm not really sure, you'd have to comb some of the tables to find those values...