These are replacement dogs for popular sizes of Freeman hatches. However, this is not the entire list. We can quickly special order whatever additional parts you may need. Hatch sizes reflect the actual domensions of the hatch opening Note that, historically, the 15" x 24" Rectangular Hatch has had three different dog lengths: 7-1/4", 9-1/2", and 11-5/8"; please measure your original dog when ordering for the 1524 hatch