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People have asked about these from time to time. I have had them hardened and tempered before surface grinding them. https://pesltd.uk/?product=65-2528 https://pesltd.uk/?product=65-2529 https://pesltd.uk/?product=65-2530 These could also have the 66 prefix. More commonly used with B31 B32 B33 B34 M20 tune up kits (Gold Star) Mark
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