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The 520 is basically a racing chain for when weight is more important for longevity. The only one I see is at SVRacingParts.com for $165.
The $220 item in the main chain link at SVRacingParts.com is a 530 which is a larger than stock set.
The $220 item in the main chain link at SVRacingParts.com is a 530 which is a larger than stock set.