I think it was from a 2001 silverado. They are all the same anyways. No big changes besides little stuff on vans like oil fill tube or dipstick. Dont be too picky about what motor you get. They all act the same. If i sold you a 5.3 and lied to you and it was a 4.8 you would never know it unless you pulled a head and noticed a flat top piston. Even the 6.0 isnt leaps ahead of a 5.3 honestly. I personally own all 3 variations and have had a turbo 4.8 that made great power and currently have a turbo 6.0 that makes a little more power a little earlier.
