Charnwood Island 111 stove rope dimensions

Hi. Has anyone got a Charnwood Islsnd 111 stove that they have replaced the stove rope on? I am not sure what diameter rope to buy and the instruction manual doesn’t say, just points me in the direction of a very expensive spare! I have measured the groove but still not sure, think a 10, 11 or 12mm! Also, is the rope the same between the door and the glass as that needs replacing too? Grateful of any help here before we tackle this!

I'm an antique stove restorer. send me a picture of the door inside and the area in the stove you're trying to upgrade and I'll see what it looks like (free)