Cannondale SL

HI all,
My sons bike is fitted with a Suntour Zeron chain set.
The bearings are shot and I have not been able to find a replacement.

Is there a Shimano item that would fit? I'm not sure if the right and left handed threads are compatible. I need the cranks with a 34 tooth chain ring and the bearings.

Please send me any links for relevant items.

Rgds

Michael.