I will check to see where I found the ones for our sled.
The box that we have on the shelf is marked on one tag: G7-304 STD
Another tag says: GPG7-304, PSTN ARCTIC-KAW 340 F/A, Fowler Distributors GP
The box says: GPI
We have had no issues with the engine running these pistons. I am not remembering where we bought these.