Maybe you can get a bit creative?
I have a few dozen different Morgans. Acquiring a full date/mm set will be a long, long term project, if ever, for me. I have a couple of used Dansco Morgan volumes, but my small collection looks really rough in those—way too many holes! I don't have the mental toughness to stare into all of those impossible voids... But I do like the Dansco's better than three ring binders, so my solution was to do the following:
I acquired standard sized, PVC-free pages for 2x2's. I cut them down to 3 slots x 4 slots from the 4x5. I used one existing hole for the first post. I had to punch a second hole to get the right spacing for a Dansco. I also added a third hole in the middle, and cut a hole in the Dansco to catch a third post, just for added security with the dollars and the flimsier PVC-free pages.
I did not use my Morgan albums. Instead, I bought a larger, cheap, used Dansco from my LCS (I guess it was a not so popular layout for State Quarters
), and modified it by adding the extra hole. I also had to take shears and shorten the cardboard flaps by about 1mm to give the pages more room to lay over. With slabs, the extra thickness might be a showstopper for that reason. I don't know how the larger pocket pages might fit, but there may be ways of working around that, too.
BTW: I store my coin albums flat, as I do my nicer hardback books—easier on the spines, without all that torque. I don't know how well my configuration would work for those who want to stand a book up.
I also made this mod with my 7070. I added one extra page, which allows me to have 12 more type coins of anything I please that will go into a 2x2. My poor man's appendix.