This bolt-on Extension plate is perfect match for Perun moto KTM 690 Enduro Luggage rack SD.
Doesn't fit on Perun moto Husqvarna 701 Luggage rack!
Before ordering, please check Shipping Info page.
Instructions HERE. Not that anyone needs instructions for it.
For Extension plate goes the same as for Luggage rack - it was designed to carry lighter soft bags and/or Rotopax container (1 gallon). It can carry as much weight as mounting points (threaded inserts in the plastic tank) can endure, but I don't recommend putting more then few kilograms to the back, because of possible bouncing issues. Check this blog post, to learn how to prevent bouncing of the rack.