Original radiator petcock for a 50 Merc?

Hi Guys

While changing the antifreeze in my Merc, I realized that the radiator pet cock was stripped. I tried buying a couple of aftermarket ones, but apparently the original in slightly tapered and I ruined the new ones as well. Does anyone have an original petcock for a 50 Merc radiator I can purchase?
Here is a pic of mine without the wing on the end. That's the piece that stripped off.
Thanks.
Happy Holiday

 

PM me, I think I have one.........Beet