Hi
Taper Roller Bearings is the best option But you need to some modifications to spacers as the sizes are different
Standard bearing is 62 x 30 x 16 Taper Roller is 62 x 30 x 17.25.
The very close second is Angular Contact Bearings.
Original bearings are only just adequate for the job
Ketan I know will not use any forum to advertise his expertise.
Myself not having any connection at all with this company and only know of the excellent reputation through the writings of other and my reading across several forums.
Got to this link and all the information for bearing replacement is available
http://www.arceurotrade.co.uk/projects/C3_BC/pages/index.html
or this link can be useful
http://www.toolsandmods.com/lathe/mini-lathe-headstock
I hope you don not "Black List" me for this post Neil just trying to get good info to a fellow Model Engineer.
Eric