I forgot to post my results on the bushing I listed in post #80.
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They do fit the smaller diameter bolt shaft and the recessed hole in the frame mount. Although some of the 6mm height will be lost in the the recesses of the spring assembly and the frame mount, you will have to remove about 2mm (of the 6mm height) to get the spring assembly to sit down solidly on the frame mount.
It worked as intended, but in my car, all adjustability is lost. Since my spring assembly never moved in the 12+ years I have had it in place, and because I want to adjust the location of the spring assembly to both 1)eliminate the spring assembly hanging over the large latch opening and to 2)cover up scuffs left by the original solid stop piece, I am choosing not to use the bronze bushing.
