When overhauling the cylinder-head combustion area, renewing all the valves, springs, seats, collets and Valve stem seals is the only correct way to ensure full reliable performance.
Other components you will require to complete:
Take the time to lap in both inlet and exhaust valves carefully with a good brand of lapping-in paste.
Add as many parts as you wish to the same shopping cart, new gasket sealant 08C70K0234M and Valve stem seals 33M1211900 for example, and still only pay the same single fixed price shipping cost.