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@O'Shane
Depending on the thickness this would be quite easy to machine at home. 4mm should be fine, no? 6082 Alu can be bought to size online quite cheap - 4mm x 160mm x 160mm is £1.60 from here http://www.aluminiumwarehouse.co.uk/ Make the design in wood or plastic then use a router to trace the shape. It's how I'm going to be replacing the broken spider on some cranks I have.
If I had the time and the money I would make these for people, probably even slightly custom due to different frames.