We sell the fitting kits separately so should you already own a rack then you can buy the kit to suit your bike. We have listed the rack that the kit was designed to fit however you might be able to modify them to suit yours. Remeber all of the fitting kits are made from stainless steel so cutting them means they won't rust however they are harder to cut.
Some bikes have 1 kit which will hold a topbox and/or panniers.
Some have 2 kits, one which is designed to hold the rack and perhaps a top box, the additional kit is designed to hold panniers. So should you wish to hold panniers you will need both kits.