Yeah, I think PCA specifically allows alternate control arms in the 944s as they are a known weak point. Thats the advantage to running a category with limited models allowed. I'm not sure what NASAs take on it is. Certainly for their marque 944 series I'd imagine they'd allow it. But for larger categories that have a hundred different models listed, allowances like that can lead to wild repercusions. As such, SCCA IT allows no mods to that component.