8HP HD Aluminium oil pan with replacable filter
This is what we use on our Dodge 8HP70 and 8HP45 tranmission and it fits and work perfectly.

12 pack of Motul 1L Transmision Fluid ATF VI 100% Synthetic
Used for 8HP transmissions.
Around 9 liters are required to fill 8HP tranmission so you have few extra if you spill it or want to flush it after few miles to inspect the oil.

8HP All variant Oil Pan Gasket