Replacing the cam-chain and the associated tensioners and guides is simply common sense when overhauling the valve train assembly along with valves, valve-springs, retainers and seats; possibly even new camshafts if the lobes on the old items are worn?
Interfacing worn parts with new can cause premature wear of the new items - even new valves are better with new valve guides rather than reusing the old, partly worn items?
Other related parts you may wish to consider:
Add as many items as you wish to the same shopping cart, new tappets 1289117E00 cam-chains 1276019F01 & bolts 0713006123 for example, and still only pay the same single fixed price shipping cost.
This component will almost certainly have other applications within the Suzuki model range; so, please check the part-number is right for your machine prior to ordering?