I'm short on projects at the moment so I decided to tackle to original busted-up shaker so I have a spare eventually.
As you may recall the original was damaged in the carb fire and the edge was run over during the prior owner's rush to get the fire put out. I had my body guy strip it but when he found it was so damaged I told him to stop the work on it.
The basic shaker domes are interchangeable from 71 to 76 (1970 had a thin edge version) but were modified depending upon the year it was used. From 70 to 72 they had a flapper valve that would be activated by two solenoids but starting in 73 the flapper was cancelled and a riveted cover and frame took their place in the rear opening.
Here's my busted original:
Here it is with the mounting flange set on it. These were riveted to the shakers in a process that usually caused stress cracks in the fiberglass. The 70-72 mounting falnges have a two stud mounting system that attaches to the air cleaner with two wing nuts. The 73-76 units used a large ring that used a single screw to retain it to the air cleaner.