Where can I buy Sirion 1.3 brake drums?

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Hello, does anyone know please where I can buy some new drums for my 1.3 (F-speed) Sirion? Is a main dealer my only option? My mechanic tells me they probably won't need changing, but I wanted to get some new ones just in case as I want to overhaul / service the braking system. Especially since I am now finding it so difficult to get hold of replacement drums, I figure I might just get some anyway and put them in the garage for another day. Thanks in advance.