If you lose some and the snow goes on your strap and clutch, not very good when going uphill in fet of powder.Better glue them.Get used to losing them if you ride aggressively at all...you will lose a couple every ride which gets expensive over the course of a winter. They can be purchased like oler1234 said at any BRP dealer. Cheers.
But you have to buy the whole panel.If you talk to the right person you can buy them seperatly at Martin west.