Trouble with rebuilders is that they quote the really expensive item as their reputation is on the line.

In the end i cleaned and refitted the original bearings, they were genuine and marked with custom grind codes for the pre-load as well as alignment marks. Pre-load is set in the bearings as the spacer collars are identical in length, i think if you fit un-ground bearings you need to get the spacers ground for pre-load.

No grease - this head is oil lubricated, total-loss system.