I purchased 3 sets of bearings off ebay recently from different suppliers.
All are tapered steering head bearings for RZ350
Prices including delivery in AUD
Quadboss $53.55 out of USA
Pyramid $37.99 out of NZ methinks?
All Balls $64.80 Aussie seller.
Below is a few pictures and a short video, make up your own mind on value for money.
The Pyramid seals are marked "CLARK SEALS"
All Balls & Quad Boss are both All Balls bearings
Seals are marked "D8146 & TTO"




And a little low quality video which says it all about manufacturing tolerances.
Note the sound difference when spinning the bearings on the table, this translates to the feel as well, there is a marked difference in smoothness of operation.
I hope this info is helpful in making an informed choice.
GMU..