Some perceived that particular bracket arrangement to be "not what they were expecting", as under load the pump would lean into the belt, then relax when the load was gone. Worked great . . . as long as you didn't try to adjust the belt tight (like Ford and GM power steering belts, which ALWAYS squeaked under load). With the bracket adjusted to specs, probably a bit looser than you might expect, the belt lasted forever. No squeaks or sqwauks. Even when the pump was sitting a bit sideways on the motor!!!
BUT, as I determined way back in the later 1960s, after the workings of that bracketry had been explained to me by Chrysler service techs, too many people expected the belt to be adjusted like a GM belt, so they went to a solid mount bracket. One of Chrysler's unique engineering feats was replaced by a "common bracket" that everybody knew what it was. Oh well . . .
ONE thing I learned long ago, "Never suspect something is "junk" just because one might not fully understand it". This was especially true when knowing the product (AND how it worked) was important to getting the best performance from the product. Chrysler, like Ford and GM, had their own unique way of doing things. In engineering and design, especially. Cars certainly were NOT "all the same" back then, unlike in more modern times. Which is one reason I like Chryslers so much, because they were not the same as the others, many times much better than the others might ever suspect. FWIW
Obviously, that Chrysler power steering pump bracketry was more expensive to produce than a normal bracket, which came later. One little thing which got changed in order to use the more generic Saginaw power steering pump, most probably.
Thanks to
@Big_John for posting the link to that Chrysler MasterTech video.
Happy Holidays!
CBODY67