Description Reviews MINI Cooper Dowel Pin 11-28-7-536-643. This dowel pin locates the Alternator to the block on all Gen 2 MINI Cooper & Cooper S's. Fits all N12, N14, N16, & N18. This pin is handy when rebuilding a motor. The pin can be stuck, bent, or missing. The size is M11 x 14 and come directly from MINI.