I don't know if I found the difference in the two when I ordered it. I think I chose 74828 because it was cheaper.
I have 90 degree hose sections mounted on the outlet of the defroster. They make for a neater installation by keeping the hoses close to the firewall. The valve is in the inlet 90 degree hose and then the hose from the engine is attached to the valve. There is a place on the valve to attach the cable.
