GM Guy
Manual Trans. 2WD Enthusiast
technically the two you have allocated for heater hose tube are for something else, I think glow plug relay bracket or alternator rear brace. the original heater hose retainer bolts were these weird tall square headed nuts with a floating flat washer on a crimped flange on the bottom of the nut so its free floating but retained. I think the floating washer let the nut tighten without spreading the tabs on the heater tube.