A is your inducer C is your exducer, the trim is determined with math based on those 2 numbers (trim = (minor diameter / major diameter) ^2 * 100) You shouldint have to worry bout b, d, or e, so long as your are sure on the turbo family and have right inducer & exducer #'s. id do it for you but im leaving town in the AM. unless your on the southside. i *think* i have a dial caliper in the shed.

Good luck!