Are you sure? According to the fsm the difference between piston diameter and cylinder bore should be 0.029-0.038 mm for #1 cylinder and 0.019-0.028 for the rest. 0.04 mm seems way too much. The pistons are stamped 91.46 but actually are 91.42. STD pistons marked 90.9 are in fact that and no less than 90.88 again according to the fsm. Also there are no rings for 91.46 or 91.42 pistons. What rings would I use? 91.50?