Lippert axle seal number cross to a real number?

seals go by the ID and the OD. What I used when I got new ones for the flat bed trailer.

Just about any dealer who sells flat bed trailers should have all the parts you need. Take what you have and you can compare them

That looks like a National Seal #
Is the seal dimension 3.376" OD x 2.25"

If so it is a NAPA NOS 22558 and any good auto or truck parts pro can interchange....

I had the same problem a few years ago with a different size axle. Only Advance culd help me, and I think they had to call the # in to get a cross. Talk to the commercial parts pro at the store, the front retail people would not be much help with somethng like this.

The NAPA store here has a eTrailer section of bins that has about any trailer bearing, seal or brake part.