Yes , as a BMW I am pretty sure its a cast aluminum alloy , probably not of the best quality, but a workshop with a good AC high frequency welding machine and compitent welder should be able to do it. , more like $ 100 tho it would take a bit of time, about 1 hour to set up, weld and clean.
You will have to strip it first as the heat will damage the plastic shims if the break is any where near them.
Brian.
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