I know this may seem odd. But I would like to find a pair of original convertible top corner pieces. They screw in just ahead of the rear window. The aftermarket pieces are always the same rounded triangle piece. The originals would come off an original top and be formed. I have found these for my 1967 and 1969 convertibles and believe they should be the same for 1970. Took a set off a 1970 big Buick for my 1969

 

I have a couple of top frames for parts. Do you have a picture of what you need? Thanks, Bob.

 

Here is an example of an original corner trim piece by the rear window. It is larger and is formed or shaped. The ones used on replacement tops are just plain triangles. Would come from a top that still had the original rear window.