Corteco seems to be the most recommended, and Trevor at Rovahfarm has a good deal on them as well as the 2 different o rings you’ll need if you’re re-using your same lines.
Corteco seems to be a go to for D1s, but not D2s.
My bigger problem is which kit do I need to reseal the box? I've found a main seal kit -- part QFW100140
and an output shaft steering box reseal kit -- part QFW100180
I'm not looking to rebuild, just reseal, and think I need the main seal kit, but am not sure. Can someone tell me?
Here's links to the kits:
Main Kit
Output Kit