It is not a westcoast girdled head, the head is just a plain WC cast head with an R&D girdle kit, the parts all work together because I bought it from a member here (JMTeam) that had it on a running ski. I have asked him this same question but seem to get no response. All I need to know is if it uses studs in the case or if I need longer bolts and where I can get either of these parts.