Here's the page from the current Sealed power catalog.
I wasn't able to get the catalog from Hastings to open. In the past I've looked up ring sets by bore size, which allows you to cross reference the same rings for different engines. For example, I bought a set of rings for a 283 chev that used the same components as the set for my 4L 6cyl Jeep.... and got two extras and at a better price.
In our case, the 4.1875" bore of the 401 uses the same ring set at the 413 Mopar.
I suggested oversized 'file fit' rings so you don't end up with excessively large ring end gaps in the worn bores.