Piston ID

All I have is the number off the top right now.
They are in my 340 that is .030" over
3690825 is stamped on top.
They also have 340 and .030 stamped in the top for the cubes and over size.
Been trying to find the number through manufactures, and I'm still looking.
Any help is greatly apreciated.
i have the same pistons in my 340 mine a trw pitons that have the same stamping as you;res