Not sure mate.
The H&R US website lists "52683" as the BL spring option (new)
The UK and German H&R sites still list 29228-4 as the part number.
Would say StreetUnit should list 52683, and that they have a keying error on their site, but I'm unsure as to the difference between the US and UK/German sites. I can tell you that my springs are black, not red
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