Check NI KnowledgeBase #0ZEF3MHR:
http://ae.natinst.com/operations/ae/public.nsf/fca7838c4500dc10862567a100753500/cba1fc627ffa0f8f862564dc0071b3a7?OpenDocument
This has information about configuring non-standard baud rates. Keep in mind that the CAN controllers are using an 8 MHz clock for the timebase, so only baud rates that are multiples of 1 / (8 MHz) or 125ns are going to be possible.