The UCE ring pack has new-style narrow, low-tension rings, which is typical of modern engines seeking lower friction and better fuel economy.
I'm not home right now, so I can't access some of the info that I have saved on my computer.
I think they are like 1.2mm or 1mm compression rings.
The gapless top ring might be okay, but I'd avoid using the gapless on the 2nd ring, due to ring flutter concerns.The newest data on the gapless rings show they perform better on the top ring location, and not the 2nd ring.
FWIW, my latest chat with Mondello yielded his preference of a moly-faced ductile iron top ring, and a cast iron Napier-profile 2nd ring, and a normal or low-tension 3-piece oil control ring.
The Napier 2nd ring gives better oil scraping for a 2nd ring, while reducing ring tension and wall friction with it's abbreviated thickness at the wall, while retaining good thickness in the groove.
The most ring friction occurs on the oil scraper(3rd) ring.