What is the difference between pre jan 99 and post jan 99 cabs?

 

Does anyone know the difference because I want to change out my cab for one with four doors? This is what car-parts.com is asking
1999 Ford Truck-Ranger
Cab


from 2/99, Regular cab, AT
from 2/99, Regular cab, MT
from 2/99, Super Cab, 2 Dr, AT
from 2/99, Super Cab, 2 Dr, MT
from 2/99, Super Cab, 4 Dr, AT
from 2/99, Super Cab, 4 Dr, MT
thru 1/99, Regular cab, AT
thru 1/99, Regular cab, MT
thru 1/99, Super Cab, 2 Dr, AT
thru 1/99, Super Cab, 2 Dr, MT
thru 1/99, Super Cab, 4 Dr, AT
thru 1/99, Super Cab, 4 Dr, MT

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