Re: Fuel neck Wittek tower clamp sizing info
One advantage of the tower clamps is the entirely smooth clamping surface. The openings on a worm gear clamp can damage the hose.
The NOS Wittek SG-28 vent hose clamp I used tightened perfectly the first time, and was very sturdy. ALL of the repro "Witteks" I have used are made from an overly malleable steel. The originals were far harder, but seem to tighten easier and more reliably.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 
1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 
2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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