That's right, BA, you fill in the blanks!
We took what was available and what was wrong with them, sorted through the good and the bad and simply made them better
First off these are much closer to the actual tube ID, they go in fine but there is no slop, sloppy seals leak! These have 3 - O rings and should be installed with grease to ease them in. The replaceable portion have a double lip so they act like double seals themselves and there are 2 per side so essentially 4 seals per side. These are designed for 35 spline axles so you will not tear a seal putting a shaft in that is too big for the seal design.
These are so far only available for 2.5" axle inner tube diameters but more sizes are forthcoming.