Bag of hooks included, but I prefer to use laces or twine to pull or fasten the stretch hoops together.( loops wont meet but the laces etc pull them towards each other, you may want to realign the route under the seat to stop material bumping up but quite easy job- better than those fiddly hooks.and keep clear of wires and connectors under the seatbase ).
Former 2011 Mk3 XTR owner alut: