Re: Fuel neck Wittek tower clamp sizing info
I figured out the correct size per GM parts catalogs, and verifying the size on one of my original clamps. Using the part number info for the hose 457516, I was able to find that the correct clamp is 1 15/16"- GM part number 9414933. I was able to clean one of my original clamps and saw a faint 1-70 build date and the 1 15/16" size stamped on it.
I purchased a pair of them from Marti, who produces them the most accurately as original, especially the alloy quality.
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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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