This is the correct belt for your W22. To replace, install a 3/8" drive ratchet into the belt tensioner and rotate the arm to release tension and slip the belt off. For installation, route the belt over all the pulleys expect the tensioner arm pulley. Using the 3/8" drive ratchet, relieve tension on the tensioner and slip the belt back over that pulley and slowly release the tension. Attached is a diagram of the belt routing: