On a couple of my trucks, I've wrapped the lower hose near the frame with a cut & tie-wrapped piece of rad hose, Cat Fuzz. I think either stop gap method is a good idea whether the lower rad hose clears the frame or not.
Gotta go to NAPA on Monday, so I'll get the elusive part #.

Remember, I've only claimed that the NAPA hose clears my K20 pickup frame with a 350 engine in the stock 4x4 position and an upturned rad outlet. No promises.