Although Wessex usually supply spare set of valve guides with all piston horns, you can now order additional spare set direct on website as required at - https://wessex-tubas.com/collections...t-valve-guides
Wessex will be adding more spares to website and if what you want is not listed please email the warehouse at coda@Wessex-tubas.com. If we don’t have in stock, then usually we can pick up on our next 6-weekly visit to the factory if not too large an item.