Last re-build (before the long rod kit was approved) back in 2016, I had Butler put a new set of the Ivey CP pistons in my pinto.
Starting a re-build for that motor and got a bad surprise - evidently the rings for the CPs and the older J&Es are no longer produced. Spoke on the phone at length with Cameron Ivey and both Speed Pro and Hastings have discontinued those sizes and Ivey was unable to obtain any.
I searched for hours, even tried European suppliers, no joy.
The problem is evidently that the rest of the world has moved on to thinner ring packs - and this is verified by the Wiescos that come with the long rod kit.
Then I got lucky - evidently Butler shelved the Ivey rings that came with the pistons and used Hastings, so I have a full set of speed-pro rings, and there was another set of tops in my spares, so along with the four 2nds I just bought from Pegasus I now have two sets if I just re-use the hastings oil rings that are currently installed, giving this motor two re-build cycles before having to buy new pistons.