S&S Cycle 2017+ M8 4.2520in Bore x 4.5in Stroke 117 to 128 Big Bore Kit - 910-0733 S&S Cycle 07-17 BT 4-1/8in Bore 5.004in 4-5/8in Stroke Cylinder Kit - Stone Gray
S&S Cycle 2017 M8 Touring 4.250in Bore x 4.375in Stroke 107 To 124 Big Bore Kit - 910-0625 S&S Cycle 124in Big Bore Kit M8 - Black