I need to locate a part but not sure what its called or where to buy it from. When you fit a built in refirdgerator there's generally a gap between sides of the fridge and the housing. Theres a supplied part which you stick to the outside of the fridge that has a magnetic strip in it with a piece of plastic attached to it to block the gap. I think its called a niche cover. My gap is too big though and I was wondering if these can be bought somewhere? Thanks.