42RH in 68 Dart advice/request

@67Dart273 , Thanks for posting those videos. So far I have the O/D section about 1/2 apart, I have to weld together a "bridge" to press the spring in the shop press.
first video walks you through it like "so easy, a caveman could do it"...but that guys tone almost puts me to sleep

Who can tell me this;
To upgrade the clutch pack in the O/D unit, do you order the o/d portion for a 46RH? All the rebuild sets I see are a complete kit for either/or. How do I go about ordering a "split" set ie; front half 42rh, o/d section for 46?