If you are considering using 030 letters, you need to make sure you have the track that is made for 030 letters.  And, if ordering 030 letters as replacment letters, 030 letters are the letters that will easily bend to go into the track.  If using 060 letters, these are the letters that typically are slid in from the end of the track to their proper place on your sign.

At least a $15-20 value!!!