Yes it will fit, as long u have it complete, since the extended cab has 2 more mounts than the reg cab.
The kits always have the 2 extra ones in case u use it on an ext cab.
the front bumper relocation brackets might be different tho, since in 98 the bumper mounts were changed.
wrongo rasher! lol, the extended cab short box uses 6 for the cab, and 6 for the bed, plus 4 crush boxes? little square looking deals for over the wheels...
if you are a manual you WILL need the shifter extension bracket, on the newer trucks you absolutely WILL need the steering extension, ground extensions, and radiator relocation brackets, other than that, it's mostly labour, bending things to make sure they are good, unhooking wiring, blah blah blah...
autos may need to extend transmission cooler lines, if you have an external cooler, on my buddy's 02 sport trac we DID have to extend the lines, not much, but about an inch or so each...
trying to remember what else i had on my kit that needed to be added in...
the long box ranger (as far as i know, only available in reg cab) uses 8-10 for the box, depending on the year, and 4-6 for the cab though i believe it's 8/6 for most years...
if your truck has been in any front end accidents at all, i would HIGHLY recommend buying a new set of front body mounts, don't open them, just have them incase... on my truck, both bolts were bent just enough that they broke and had to be drilled out of the mounts... had they been instock, i would have bought new ones at like $60 a piece... (not sure the actual price)
bumper brackets, the front look like enlongated u's on an angle...
the 98-00 model kit is identical to the 01-05? kit, with the small exception of the ebrake extension bracket, which i did not need for my truck, buy the 02 sport trac DID
i believe i was told that the pre 98 kits did not match our trucks though, when i was looking at it...
pa-883 is the one i bought, the 70033 is the "proper kit" for 01-06, though there is no changes between 01 and 11 that would cause issues... and from what i'm told, the only difference between the 883, and 70033 is the ebrake bracket, which isn't necessary for all trucks, and can be made out of as piece of angle iron if needed
Welcome Visitor! Please take a few seconds and 
and is there anything else in the truck I would have to change or modify? Like shifters and such
