Re: Brakes! Not so standard after all...
I can verify that each year 1970, 1971, 1972 are all different when it comes to brake lines/hoses-especially on the rear end.
I swapped everything from my 1972 parts Blazer over to my 1970, because I want front disc brakes, and I had already purchased a 1972 pre-bent line kit.
Those rear line brackets are 1972 only, presumably only for leaf spring trucks/Blazers.
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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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