[hugger6933]

The Z71 is the rpo for the off road package. If it is a Z truck it will say so on the rpo label in the glovebox on the last line.I am pretty sure that any pump from a truck in the 4.8-5.3[6.0] family would work from most likely say 03 to 07[maybe back to 99 but GM did a bunch of changing in the 03 model year and a lot of the wiring is different] I know the GM parts books always give different numbers to try to cut down on the inter change but I have found a lot of it will still swap around. Try car-part.com they use the Hollander interchange system that is the industry standard with the salvage yards in the USA and that will help clear up any unsolved mystery about it. Hope that helps without being to long winded. Jim