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There are various versions of the hex plugs kicking around, some good some bad.
Best way is to ask for the dimensions when ordering.
You can peen the thread over at a point where the plug sits flush and use loctite, but
some people will scream at you for doing that. (It means you will need to heat the plug
to remove it.) It's never given me a problem but that's just my take on it.

It’s the right thread but it’s not a tight fit at all. It almost seems like it would need some sleeve retainer to take up clearance. Aarrrgggghhhhh. I asked seller about it and they just said “if you don’t like it send it back. I’m not paying another 5 dollars to send back a 10 dollar part. So much of this stuff we are able to get these days is bordering on junk. I know, I should be grateful we can get anything .

I use the ones from SRM, they are a good fit thread wise but are shallower than the standard plugs and tapered at the top which restricts centre punching the plug into the original dimple on the crank.

Don’t see why it’s hard to make a copy of the original, the hex socket is a good idea, makes removal easier

I just put the original back in with the slot. I don’t imagine I’ll ever clean it again .

Good oil, changed frequently and an oil filter and you probably never will.