confused with Mcgaughys shocks???

[ProStreet83C10]

ok so McGaughys website shows 1350 front and 1850 rear shocks for our trucks with the 4.5/6 drop, but today on Summit, the McGaughys shocks showed the 1350 shock only being a 0-4" drop sock and the 1850 being a 3-5.5" drop shock. Thats 1/2" short on both ends of the 4.5/6 drop for our trucks. McGaughys makes a 2050 4-6" drop shock for the rear but its not listed as the shock needed for the kit. Im just confused about this and thought maybe someone could enlighten me. It seems something isnt right if the shock recommended doesnt even ft the range of our trucks drop height.