Where to throw the towel in

Yes, just the piston ‘‘head’’, not the connecting rod or wrist pin , just the piston portion with rings, used.
The previous months of pre-ignition pinging blew clean through the top of the piston, you could see right through it like a pipe.

“I’m surprised no one asked for mileage, and maintenance history”

In her initial post, she informed us that…
“It has 194,000 miles on it.”

In later posts, she stated that she has owned the car for about a year, and she implied that the prior maintenance history was an unknown–just like with most used cars.

You are correct. I missed that. Sorry.

Say it ain’t so. You used the original wrist pin and rod with another used piston? Whatever works.