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Well, for my 2007 2WD silverado with 4.8L engine (Same as 5.3L except bore), the part number for radiator hoses I list below. Bottom hose and hose to reservoir are about $39 each on amazon. The top hose is $68 on amazon.
I didn't list heater core hoses because those are pretty generic. Just go to oreilly, autozone, etc. and get about 10 feet of heater core hose (Correct diameter) and cut the length you need.
ACDelco GM Original Equipment 22827735 Radiator Outlet Hose (bottom hose)
GM Genuine Parts 22827733 Radiator Surge Tank Inlet Hose , Black (reservoir hose)
ACDelco GM Original Equipment 22827731 Radiator Inlet Hose (Top hose)
Well, if you want, you can get ac delco/gm hoses. Here's a list below of part numbers for the various hoses. But you can also get 3rd party hoses for a lot less. Just check at autozone, oreilly, etc. or amazon