I would bet Literski's thruxton that these are the bearing numbers that you could ask Alex at All Bearings about after all I stayed at fills house last night and had some of Pat's home brew while visiting him at the Holiday Inn Express...
Way too much caffeine. :
Tapered Headset Bearings & Seals
The following crossed referenced bearings are made by All Balls:
Top 99-3520
Bottom 99-3519
The following crossed referenced seals are made by Clark Seals:
Top CSL CY32005X
Bottom CSL CY-32006 JR
