Duplicate file search.

Hi all:
I could use some help please. I’m trying to search a mounted drive on my desktop “Plate_Drive” for duplicate files that only have the first five digits the same. Expl: 0245A_Covidien. 4 numbers with a letter. I want to target the search just to the first five digits of the file name, what ever they are. I’m getting nowhere with this.

Thanks for any help…

OSX 10.6.8

Applescript: 2.1.2