Hi Nick
Are they still Alchemy or have they been coloured charcoal? If they are charcoal Furniture clinic has a match but if they're are alchemy if you can find a place to take a sample from and send it to furniture clinic they'll match it up for you.
Barry
wow, mine aren't bad - I'm thinking just get some dye on the faded bits and it will be good as they haven't split - I do have a friend who is a vehicle upholsterer if the worst happens
Hi Nick
It's not actually dye, it's paint and it's real easy to use if you're only doing a small repair. You could do it with a small sponge or an artists paintbrush.
Barry