The oil pump and filter started with the '97 models. I owned a '96 FE501 that I bought new and rode for 8 years. BTW, it was a very reliable, trouble-free bike bike but I changed the oil every ride.
Download the spare parts list from official Husaberg site (on site are spare part list for 2003, 2004 model year)
Inside you can see for all parts from what year you can fit them.
