Your last photo just shows the plug that is removed to allow a 90 deg elbow and a 5/8" hose adaptor to be installed.
If you can first turn in the 90 degree fitting you will then be able to turn in the hose adaptor which typically points aft.
You have custom mounts that obstruct this area more than is normal. The oil pump is less of an obstruction.
It is hard to judge from your photos but I think you will just have room to install the fitting as shown.”