If you are wanting to install a drain in one/both of the oil lines, you might want to check this out:
https://tinyurl.com/Drain-PortWhen I bought one a couple of years ago, I found a stainless one. Drilled a solid brass NPT plug for safety wire. A little more compact and IMHO elegant than the blocky one offered. I would also add that any of these should be inspected for burrs at the end of the tapped thread so none come loosed and cause issues.
![[Linked Image]](https://www.tm-img.com/images/2019/01/29/IMG_1455.jpg)