Somehow you missed item #1 in the diagram & part nbr index...the CD & cassette holders are listed as item #4...and there's two part nbrs for #4 to distinguish the cass from the CD components.

If you type the BMW 11 digit part nbr for item #1 in a google search box..you should get lots of results of vendors that sell the part (BMW xx xx x xxx xxx):

If you we're to copy and paste the 11 digit part nbr listed on the website you linked us to into the part nbr search on realoem.com...you would see that the part you found was item #11 in the diagram below...which is a storage tray that replaces the ashtray under the cover next to the cig lighter:

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