I understand the cup mounts to the dome and has the 4 arms that comes out of the cup
The cup (alum.) Is threaded in all 4 holes for conduit
The block has 4 holes. 2 are threaded(on sides) then conduit on top and bottom
I can thread the t. Into the cup but the rest. I'm lost to as what the plan was to assemble it correctly

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1970 pro street cuda.
1970 cuda convertable