Bob, turns out there was a second version of the dual quad carb linkage introduced in mid-65. The second type uses this spring 1373763 along with a few different parts vs. the first type linkage shown in the picture. The second type linkage carried on into 66.
Could not not come up with a picture of the later linkage. It came out too late for the 65 shop manual. Then the dual quad became a dealer-install-only option in 66. The dual quad does not appear in the 66 shop manual. There is probably a 65 service bulletin showing the second type.
Carbs using the the second type linkage have -SA or -SB model number suffixes.
The details were dug up in the Group 3.430 parts listings of the 72 Buick master parts catalog available on line at www.wildaboutcarsonline.com
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