The rebuild kit from Then and Now Automotive includes the spring.
Then and Now Automotive AC pump 856138 is a Series F for 1932-35 Buick models 60-80-90
The AC pump for 1937-38 Packard Super 8 is number 152 3196, also Series F and uses the same rebuild kit as the Buick
Earlier 1933 to 1936 Packard models also used the same rebuild kit
Usually the only difference between the same AC Series pump type for different makes is just the rocker arm.
Then and Now may be able to tell you if rocker arm 856211 is correct for the Packard
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