I have a pair of progressive springs from Works Performance (before they became "Worx") that I originally bought for my BMW K75S.
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As far as I can tell, I needed part no. 3106H, but these are 3106 (I assume the "H" is for heavy duty). Either way, the BMW is sold, so these need to go too.
According to the Wayback machine - these fit 1991+ Harley Davidson XLH883 and 1200's.
I believe I paid $150 plus shipping - how's $100 sound?