Axle seal:72 eaton 3/4 ton

[scotts 72]

Have been having trouble with axle seal on my 72 K-20. The drivers rear seal is leaking axle fluid on the brake shoes. Have replaced the seal twice,, even tried puttin it in backwards to see if that made any difference.It did not I noticed the bearing and race are made by two dirfferent manufacturs. Could this be the cause. Aren;t the bearing and race supposed to be a matched set? Isee no burs or scares that would cause a leak,,, should i try to replace the bearing and race that are on the truck now? Thanks for any help.