Will this fix my 5.9 magnum oil leak?

DodgeLad said

Came out real easy. 1" socket. Pics below after cleanup of the engine side. There was no gasket, no sealant, no nothing. Metal to metal fit. Thinking of a thin bead of RTV and/or gasket. Any thoughts on that bright idea?

If the leak persists, I'll turn it into a project.
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You might want to take a closer look at the block where that was.
The seal behind the plate often hardens up and looks like part of the block casting,

I ALWAYS put a thin film of red RTV on both sides of the gasket between that plate and the block. (that orange seal in your original post)
Some of those plate/stud kits come with a cork gasket that goes between the plate and block around the stud in the center and those really don't matter.

Also note that I always have to tighten the filter more than the recommended amount or they drip on my header tubes.