ROCKRDR said: it shows it mounted to the body not the t-top I didnt know if there were notches from the factory or what is under the chrome..
I found a parts manual for that era of C3 online and it shows how to install the strips. Looks like there were 3 notches cut into the fiberglass to access the holes in the back of the stainless trim and then a screw and special rectangular sort of washer to hold them underneath. Also, a rivet is required in the corner where the center T meets these strips. It all gets covered up inside by the interior trim.
The GM part numbers are: 12.810 for the 6 washers
8.908 for the 6 screws
8.967 for the 2 rivets
12.075 for the 2 stainless mouldings
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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ