Dave Schwandt sent these pictures:
Here are some pictures of the A/C valve covers and the
differences between the 57 and 58.
![](2.jpg)
The clean one is from my D with factory A/C
and you can see the plumbing ports for the power piston return lines.
![](7.jpg)
The grubby one is from a C and you can plainly see the difference.
![](8.jpg)
![](1.jpg)
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