I think your are looking for pistons for a 3800 L67 engine. Try intense-racing.com. They have a forum as well. Diamond makes the forged pistons that will not require any machining for that application besides maybe boring to your needs. I apologize if I misunderstand your question, but I would...
I have a set of CP pistons for sale on 2 dot rods that are balanced.
I will take $250.00 for the set. The pistons have roughly a 1000 miles on them.
This also comes with arp rod bolts and the rings are installed.