From what I read above it doesn't sound like you have the pistons from Summit yet. I just looked at Summit and was surprised to see they have so many offerings for the 292. I didn't know anyone had a Hypereutectic, LPG piston as mentioned above and I see that Summit doesn't list one either.
At this point I hope you already know the LPG has .150" deep dish and the original low c.r. dish is .310" deep. They show the cast LPG with various 980P numbers and the deep dish hypereutec as 909P numbers.
