ive been down this route befor.
you need to find somone with the ducati tool to cross reference the tension of the sealy. i bought the original tool .if you play your cards right it will cost 180 uk pounds from kamna germany. the tension tool is critical for good timing, after testing i found that if one belt is tighter than the other the timing can be out around 5 degrees. thats why for adjusting cam timing both belts must be set at 10.5 wich mimics running temp.