Real bumper bolts,1/2” do they exist? ‘68

I ordered some 1/2 x1-1/2” stainless capped (1-1/8” diameter)bumper bolts for my re-chromed bumpers on my ‘68 Polara. I noticed two things that I did not like.
First the heads were bulbous, meaning they were not as flat as the originals.
Second the square shank is about twice to three times longer than the original meaning they interfere with the brackets. Has anyone found a source for original style bolts? I am coming up short on e-bay and other places.
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Author: HWYCRZR