Lm7 swap ???

On my 5.3 their are two smaller lines above lower radiator line what do these attach to or are their caps for these one is called radiator return line no spot on my 96 Sierra for this. Also I damaged lower tranny cooler line anyone know where to get replacement dealer said no, LMC truck had one for 24 buck but wanted 70 bucks for shipping.

Are you talking about on the water pump?

I believe one of them goes to the throttle body? The one in the middle of the pass side radiator.

One goes to middle of radiator other coolant tank, so do I need coolant tank and radiator from 99 newer truck??