Hydroboost or vacuum booster power steering pump on 1993 gmc sierra?

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sniperlif3

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I have a 1993 gmc sierra that is having some power steering pump problems so i am going to replace it. I looked at autozone and they offer two different types which are:
Hydroboost
http://www.autozone.com/autozone/parts/Duralast-Power-Steering-Pump/1993-GMC-C1500-1-2ton-P-U-2WD/_/N-izrl7Z8oxk0?counter=1&filterByKeyWord=power+steering+pump&fromString=search&itemIdentifier=10662_0_2558_3370


Vacuum Booster
http://www.autozone.com/autozone/parts/Duralast-Power-Steering-Pump/1993-GMC-C1500-1-2ton-P-U-2WD/_/N-izrl7Z8oxk0?counter=2&filterByKeyWord=power+steering+pump&fromString=search&itemIdentifier=10661_0_2558_3386


What is the difference and which one do i have?
 
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