You might consider making your own - there are threads in here about such activity and you can use the search facility to find whatever key words that you like.
As ever, this is a trade off between paying cash for, in this case, the BMW product or spending your time working with your own hands (although you can get a workshop to assist if you are not too happy with that!).
Time rich, cash poor or vice versa?
In case no one has said it already,
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Dave
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