You are right it isnt self explanatory. There might be slight valving differences causing the multiple listings. Kind of like the OME Comfort, Medium or Heavy. Are you looking for a stock type replacement, something that you might be able to lift later on or? They have an 800 number you can call for more clarification.
I just spoke to Bilstein and their website is corrupt. They looked up each part number and gave me the breakdown.
F4-BE5-F332-H1 is 4wd front
F4-BE5-2482-H2= 2wd Front
F4-BE5-2482-HO= 2wd Front different years
F4-BE5-2451-HO= Rear Shock 96-99
Tech at Bilstein says best to download current applications guide since hte online search function is corrupt and innacurrate.