Hi Joe,
Here are dimensions from my '55 second series 3200. At the rear springs the front perch bottom rivets are 4-5/8 inches center to center while the top ones are 4 inches. The rear shackle rivets are 2-1/16 inches on the bottom and the top are 4 inches. I took these measurements by holding a tape measure on the rivets in fading light so accuracy is probably plus or minus 1/16 inch. Does that serve you well enough?
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