Have you tried CP pistons? They seem willing and capable of producing custom slugs when Wiseco can't. i know that they are a bit pricier, maybe thats the factor. Where are Wossner from?

I actually have a set of Wisecos I got from you a whiile back. Are these different? I still haven't put them in yet. years after.
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MC21 300R w/SE bits, Rossi 2001
MC28SE Silhouette Repsol