Square head Oil Vent Part # (helped!)

[Turin]

I'm almost done building a motor base on a lemans 1000. A lot of parts including a set of bare heads were purchased on E-bay. I've acquired all the obvious stuff. What I'm missing is the oil vent return nipples that screw into the head. Any one know of a part #, an aftermarket replacement, hardware store substitute or, even better have a pair laying around?
Thank You!
See pictures.

[Antietam Classic Cycle]

Part no. 28153960





What diameter is the hole - M8 or M10? I may have some from a V7 Sport, but they're M8.

Looks very similar to the vent fitting on 5 spds., before it was moved to the rear cover.
 

[Turin]

Thank you!!!! Pretty sure they are M10.

Update - found via E-bay Italia! Thank you Charles !

[Antietam Classic Cycle]

Thank you!!!! Pretty sure they are M10.

Update - found via E-bay Italia! Thank you Charles !

You're welcome. I looked through all of my stash of parts and didn't find any.