Send Mr Singh a pm. He has new Gladen 201 kits in stock this month. Consist of an 8" underseat, 4" mid and a tweeter. All plug and play specific for BMW. I'm actually installing it now in my car.
The hertz mid range speaker you linked had a mounting depth of over 60cm so you may struggle to fit them.
How are you going to wire this up, do you have a harness?
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