ARP BMC B-Series Head Stud Kit. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. Wiseco Piston Kit 88mm Bore 9.1:1 CR fits RSX Civic K20 K20a K20a2 K20z1 K20z3. Wiseco 8.0:1 93mm STROKER Piston Kit fits Subaru WRX EJ20. Manley Piston Set 86mm STD Bore 9.0:1 CR fits 08+ Mitsubishi Evo X (4B11T). Manley Piston Set 86.5mm Bore 9.0:1 CR fits 08+ Mitsubishi Evo X (4B11T).