Found what I can that engine is not a Briggs engine but a darn junk Chinese clone. Your best bet is to try the ODK forum link I posted. You probably get the same comments but they have seen before but are not in the USA yet.
The only the US Briggs dealer support had was on the mower 2691812 which only a few parts for the engine.
I was afraid that the investment company that brought Briggs would start this screwing up Briggs product line. I ran into something similar on parts last year where I had a two year old engine still under warranty that no engine parts were available.