I have a HT23 that I am trying to get blades for the deck. The serial and model number of the deck have been removed when the deck was repainted and the old blades are missing. It seems that there were both 54" and 60" decks available are there any identifiable marks or can some one give me a exact measurement of of each deck for comparison? My deck measures apprx 61" outside across the top. I am going to get the deck off and measure underneath first of the week.