I just went though this on a heavy 9 I just got.
Neither of the oil fittings on the apron are stock, they're both special.
Even the one without the extension tube (left hand side) won't fit either
a right angle version or a straight version.
I wound up buying two right angle versions and rigged them to press fit into thin wall
brass tubing (required turning the OD of the spigot on the fitting, by holding it with a
mandrel into the bore of the fitting) and then pressing that tubing into the apron.
That was the only way to get the right angle part of the oil fitting from interfering with the
top of the carriage that overhangs the apron.
The half nuts oiler was tougher, I had to solder an extension tube onto the tube that
was pressed into the apron, sized to be as long as the original, to drop the oil into the
trough on top of the halfnuts.