These are a set for both the front and rear timing chain tensioners. At some point though the tensioner reaches of its travel and then, when the chain stretches just a little more it starts rattling, usually against the spark plug tunnels (tubes) causing the damage. The chain can eventually wear a hole in those tunnels which then fill (slowly) with oil and suddenly the rider notices oil seeping down the side of one cylinder. Easy install,no instruction Fitment: Fit for Classic 1500 1600 Fit for M95 Colour:Silver Material:Metal Package Contents: 2x Cam Chain Tensioner Extenders Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.