Found this easily accessible US website with Firestorm part numbers albeit some of them might be for US models.
Lots of other Honda models as well as as Kwaks, Suzis and Yamas inc a searchable database of part numbers.
http://fiche.ronayers.com/Index.cfm/Mod ... /CRANKCASE
VTR1000F 98-05 Part numbers and many others
Re: VTR1000F 98-05 Part numbers and many others
or you could try this site,it covers all jap makes and does have some uk bikes as well.plus it gives availability of parts and price in euros http://www.cmsnl.com/