For all wheel parts for our 77 model 33.5 foot
trailers equipped with Hadco axles, I have included part numbers and info that will be helpful:
523603 Seal
516033 Z-ring
LM501349 Inner Bearing
LM501310 Inner Race
LM67048 Outer Bearing
LM67010 Outer Race
Supplier: Six Robblees'Inc, Seattle, WA
Phone: 800-275-7499 ext:3034 or Ask for:Matthew Groth
This individual was very informed and helpful. He shipped all of these parts to me direct. FYI
You would need to order 4 of each of the part numbers listed if you intended to replace all original parts on a tandem. Also, Z-rings are sometimes difficult to locate in a pinch.