or perhaps more importantly where can I get another one from?

My new (to me) Series 3 has these on the hubs fitted with 235/85R16 tyres but the spare looks like a standard wheel fitted with a 205 R 16 tyre, want to get the spare to be the same as the others.
WP_20160630_07_58_13_Pro.jpg
Thanks in advance.

Richard
 
That is a pressed steel wheel.Unless the pop rivets hold something on the rear of it like a mud slinger. Somebody has been playing themselves.
 

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