Deinstitutionalized player w/ lost track numbers

SanDisk MP3 players SanDisk® Clip Sport
17

I like to use 2-digit track numbers in my ID3 tags like this: 01  02  03

  This style does not work for me:  1/12  2/12.    Also this does not work for me:  01/12  02/12 etc

And I use  ID3v2.3 ISO-8859-1 tag style.  I delete all other tag metadata from my MP3 files. (v2.1, Ape, etc)