I made it from an original, old R89WP that was wasted. I cut the top off, and simply set it on the modern Delco battery in the car. I then used the original hold down. Looks like day one.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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