Been offline after a couple of weeks in China, where the forum of the Mighty Falcone is apparently considered subversive enough to be blocked, along with Facebook and Google....
i still have the stock bearings installed in mine, but understand that the taper roller conversion is based on stock SKF bearings, that are ground down to fit the recesses for the stock cups.
The kit is available from Pirner, and cost about 89 Euros back in 2014:
Instruction sheet from Pirner, courtesy of Kater