ZXR250 Part Numbers? Problem..

As my ZXR250 was never officially imported by kawasaki australia i cant get replacement parts without a part number now the problem i have is that i blew up a bearing on saturday while riding my bike for the.. first time after my $900 mechanic bill and he neglected to replace the sprocket bearings or the wheel bearings, now i want to pick them up and do them myself but kawasaki distributors need a part number, which i dont have because my bearing is in 1000 pieces on the road somewhere.. would anyone that have a ZX2R be able to give me some part numbers or anyone with experience with a problem like this?