Found a great touchscreen monitor for OP

[rastam4n]

Outside is ground. Inside pin is 12 volt. What brand/type plug did you find?

Thanks beercansailor

I actually found a plug from an old laptop that fits perfectly. The brick says its a liteon. Can't use it as it is rated at 19v but the plug will work fine 
Getting excited to for OP2 on the Rpi4 with a new monitor that should not overheat like my old one did...