That 5 in the model number indicates the second digit of the cu ft capacity. I cross referenced the door gasket for that freezer to 15 cu. ft. models, so the model number likely indicates that the freezer has 15 cu. ft. of capacity. Technically, it was 14.x cu ft and rounded up to 15.
Here a similar Kenmore chest freezer, 14.1 cu ft: sears.com/kenmore-17142-14.1-cu-ft-chest-freezer-white/p-A058458720?sellerId=SEARS
Kenmore upright freezer, 15.3 cu ft: sears.com/kenmore-22152-15.3-cu-ft-upright-freezer/p-A104480509?sellerId=SEARS
All freezers: sears.com/appliances-freezers-ice-makers/b-1020019?searsTab=true
Hope this helps!