Control arms kit which size?

TOM.S

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Hello everyone.
I've been looking at some control arms kit on the bay the other day, noticed they come in either 16mm or 20mm ball joint size.
how can I find out which size would I need for my 2.0TFSI saloon?
I mean is there any way of getting to know the answer other then getting under the car take the things apart and measure them?
any advice would be greatly appreciated.
Thanks in advance...