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The part number is K542M81AP. I bought them for my GSR (b18c1) to achieve the compression ratio I was looking for. Wiseco has a chart with part numbers and what block/head combo you're looking for to show the different compression ratios with certain size headgaskets.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.