These are ultra-cult! For the understated look you can buy black chains for your Stows.
As with the silver chains, there are two sizes available. The chain with the longer steel extension bar works with the Neville-type alarm and the chain with the shorter extension works with the Delkim-size alarms.
Korda expect these to be hugely popular!
1 per pack
Korda Stow Bobbins Black Stainless Chain With Adaptor Long
Korda Stow Bobbins Black Stainless Chain With Adaptor Short