If you lower the bike, make sure you lower the front and rear exactly the same.
Option one is to get regular XB forks and rear shock. They should be about 2" shorter.
Option 2 is to do the mod above for the rear shock and if you have room with your handlebar combo, is to raise the fork tubes in the triple clamps.
Ghetto option 3. You can cut the spacer though. It's the metal tube on top of the springs. Cut them both exactly the same. Your fork oil level spec will be the same.
Don't cut the fork springs. Ever.