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I absolutely love doing E Body side glass and this is one of the very reasons why I do...
...For I too, learned this lesson many moons ago... 
The horizontal slider bar bolts to the glass with two different types of bolts. The forward one is a phillips head screw type bolt, and the rear one is a 7/16 head 1/4-20 bolt. There's also a rubber plug in the center of that bar that should be in place.
The front bolts screws into the plastic retainer in the glass and is a no brainer...It's the rear bolt that you MUST be careful with...It must pass through a metal spacer washer, a rubber hose insulator and the into the track guide on the backside of the glass.
If you don't have all these little items in place the glass will break...I'm 100% certain of it... 
these parts were in the kit i bought. I dont know if I used them or reused the originals thinking "hmmmm, these parts look fine. I'll just reuse them instead of screwing something up by replacing them"
and then I may have mixed up the bolt for the rear horizontal track and the rear vertical slider track top bolt. i remember wondering which one was which
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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