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When the blue book says thicker, is that wire diameter or overall diameter of the spring?
-> The blue book doesn't mention any wire diameter. I got those diameters (not spring overall diameter) from few other sources.
Spring #1273977 has wire diameter of 11.3mm, #1359710 has 11.9mm and #6819404 has 12.7mm (measured this on my car). And there's also spring #6819405 with diameter of 13mm.
Surprisingly spring #1359710 were installed on 940 wagons - confirmed this by looking into websites that sells 940 wagons with their chassis number mentioned.
So that leaves spring #6819404 and #6819405 as HD variety. Even if #6819404 installed as standard in 940 sedan, it must have been coupled with soft damper/absorber to balance it out.
Amarin.
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