You might realise that RS no longer offers spares like this, instead expecting you to buy a whole new damper.
I carried this as a spare since I fix my stuff at home, but I find myself without either of the Charger 1 forks I had custom valved and this is therefore surplus to requirements.
This will not fit a Charger 2 at all. But if you’re looking to get more life from a charger 1 fork after a burst bladder. this is the kiddy.
These are increasingly scarce and prices are rising. £35 plus postage.