The Carrillo Pro‑SA connecting rods are supplied for Mazda 1.6/1.8 B6 and BP engines and use 5/16 WMC bolts in their proven configuration. These connecting rods are a Pro‑SA series offering explicitly listed for the B6 and BP engine families, intended as a direct replacement rod set where those engine specs apply.
Carrillo Mazda 1.6/1.8 (B6 & BP) Pro-SA 5/16 WMC Bolt Connecting Rods