[Specialist5]

I have a 2014 435xi. This summer the hose that goes from the upper radiator hose to the coolant tank broke (part no 17128570061). This is a common failure I'm sure you all are familiar with it. So in replacing this hose and the upper radiator hose I lost the small clip that secures the overflow hose to the coolant tank. I used a piece of wire to secure the end to the tank. It worked for a few months but now it's no longer air tight, and when pressure builds up it leaks coolant.
I've searched everywhere but can't find this part. I even ordered a 3-pack of clips from Amazon and Ebay. But in these packs even the smallest clip is too big. Does anyone know the part number or where I can get this clip from?