Seals fit and did not leak!
Date: August 10, 2018
Seals were similar to those we removed and they are not leaking.
Other "mechanical" seals we tried from Dexter leaked for some reason. Installed three of those with the same results. If you installed them backwards it looks like they could work but installed "air side" towards the trailer frame they don't seem to make proper contact.
No leaks so far so am pleased with the purchase.