I did order the GM 'fits a thousand different variants' spring cushions. Based upon my measured value for the outside diameter of the springs the cushions are about 1/4" -3/8" too large. The inside diameter looks like it will be just fine. The part number is AC Delco 45G18708 and I sourced them from Rock Auto.
I haven't installed them yet. I had other things to do in the Fall and its serious winter here so I am disinclined to work on the car. Based upon 'eyeballing' the spacers they should fit fine or at worst require some minor trimming of the outside diameter.
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