I have an elderly Kappa jacket with a broken zip. I love this jacket and want to buy a new zip - but all the zips I can find are either 26 inch or 28 inch. Measuring all my jackets and fleeces with open-ended zips I find the old ones have 27 inch zips but the newer ones have 26 or 28 inch zips. Does anyone know where I can buy 27 inch zips? Surely I'm not the only person who wants to repair a garment like this? TIA