For 220mm rotors. Bolts for both brake calipers: (4) 30mm bolts (10mm longer than most OEM).
30mm bolts are seen on the Talaria MX4 and X3 OEM. Uses a 10mm spacer.
30mm bolts are used with a 10mm spacer.
30mm bolts may be seen on other style brakes, usually with a 220mm rotor.
If your brakes use the 20mm bolts (usually seen on 203mm roto