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Yes for competition , A got from an old racing colleague a bit for my time of racing ! Porsche stopped them both Mahle and Wahle to make them with 22mm piston bolts as I have on mine! so here is probably the problem to find then in this measures on the rings 98 mm 1,5x,1,5x,4,0 mm,, I hope Wahle have some old ones left or they produce new ones,, they produce all sort of funny measure you like .
But these days you are banned for life from historic racing if FIA finds out that you use these ones 98 mm in RSR 2,8 or 3,0 RSR, ok not too simple to find out! but you can make compliance and that happens!
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