From left to right we have the RCM 14mm WRC head stud, the RCM 14/12mm Group A head stud and finally the tiny looking 11mm ARP head stud.
Subaru Head Stud Size Comparison
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From left to right we have the RCM 14mm WRC head stud, the RCM 14/12mm Group A head stud and finally the tiny looking 11mm ARP head stud.