Size 4 Blade Front Size 3 Blade Rear
16" x 20" (1654-160-20) 14 3/8" x 20" (1651-144-20)
16" x 21" (1654-160-21) 14 3/8" 21" (1651-144-21)
15 3/4" x 22" (1654-158-22) 14 1/4" x 22" (1551-143-22)
15 3/4" x 23" (1654-158-23) 14 1/4" x 23" (1651-143-23)
15 1/2" x 24" (1654-155-24) 14" x 24" (1651-140-24)
15 1/2" x 25" (1654-155-25) 14" x 25" (1651-140-25)
15 1/2" x 26" (1654-155-26) 14" x 26" (1651-140-26)
15" x 27" (1654-150-27) 13 3/4" x 27" (1651-138-27)
15" x 28" (1654-150-28) 13 3/4" x 28" (1651-138-28)