Whats wrong with your current spindle? Has the grease seal worn a groove in
it?  If so, you can use emery cloth to polish this out. I understand that
this works many times. The test is whether or not you can catch your
fingernail in the groove. If it catches, the polishing may not be totally
effective.

Go Westy once advertised used spindles in their catalog. Not cheap, about
$200/pair.