Faldage will beat me to it.

You got you about an hour and a half Dr. Bill. I ain' got nothin here at work. No, wait... looks like it's gustus.

That'd be:

      Sing         Plural     
Nom   gustus       gustes
Gen   gustus       gustium
Dat   gusti        gustibus
Acc   gustem       gustes
Abl   guste        gustibus

That's *if it's third declension but I have this feeling it's fourth declension.