If there's an existing wire for something else going from the console to the compartment you could use it to pull a fish wire through and then use the fish wire to pull the original and new wire back.
Welcome, as you have discovered they're hard if not impossible to find.
Your best bet is to get a custom one made from a local canvas/tent/awning shop.
Maybe you're over tightening them?
I've always just hand tightened them and then snugged them up.
I've never used anything on them.
You're not dealing with any pressure to speak of.
Welcome.
A serial number would help as there are 2 possible systems for that era.
A picture of where the leak is would help as well.
Can you describe this "housing"?
Is the pump in the boat or is it part of the motor?
I have a 1974 and 1980 version of the 3.0 and neither have a block drain at the rear of the starboard side.
They do have the oil pressure sensor in that area.
