The output shafts are thinner so you need to use a thicker o-ring for the seal run. Measure and make sure. Ended up using a metric o-ring. The output shafts have a machined step on them which makes it difficult/impossible to fit the o-ring/seal run assembly once the tranny is together. The o-ring hangs up on the step and does not seat in the seal run, or seat fully home. Fit them before you assemble the tranny. Use a thin screwdriver to push the o-ring into place before pushing the seal run home.