Years ago

Every HOT ROD magazine had ads for them. They were made by PSI Industries I believe. Honest Charley's sold them by the hundreds.
( Honest Charleys was like Summit Racing and Jeg's are now ..
Major mail order supplier ).
With the three bolt holes as a pattern, it made drilling a frame almost mistake proof and the brackets made installing front ends easier
for those who could not weld

I bought and installed 3 or 4 sets ... 25 to 35 years ago.
There are always a few sets for sale on eBay ... NEW
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This was a typical 50's/60's 32 front end setup ( the 32's above )
Some used a stock wishbone and split it while the " MORE " $$$ crowd bought the hairpins. The really $$$ crowd bought CHROME hairpins.
Below is another very popular bracket ... back in the day ... same as the aluminum PSI in function, but easy to made at home ...
but they were available over the counter also. The metal ones ( non aluminum ones ) look even more traditional IMHO.

John's ride to the cemetery, his beloved Billings OK bus, The Baby Elephant!! Traveling in style!! As his service was starting I couldn't figure out what the music was, heavy on a flute in a jaunty...
John Norton aka johnboy