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@moog
Aluminium needs to be annealed before bending to prevent it from work hardneing (this causes the metal to crack tear and weaken). An easy way of doing this is to rub some white soap on the metal then heat it with a gas and air torch until the soap goes brown. Leave the metal to cool to room temperature then bend away.
The easiest option to do get the shape you want would be to buy some bars which are close to the shape you desire and then modify them. Unless you have links with someone who deals with metal suppliers I think that you will find it hard to get a short length of metal for a decent price as most just can't be bothered to deal with one off customers with small orders.