I did a little research
after you PM'd me. Here's a photo
of a Rocna
25 on an IP 35. I found it on Hayden Cochran's Island Packet
Yacht Owners Association website. In fact, it's Hayden's boat
How the bail on the anchor
roller interacts with the "roll bar" on the anchor
is the deciding factor on how well the new-gen anchors will fit. Looks like a pretty good fit to me, with plenty of room, but it would depend on how similar your anchor roller setup is to the IP35's.
If you're not familiar with the IPYOA.com
, you might want to join up. Hayden is just about the most helpful guy in the world, so if you have any questions just ask.