As far as I know, they are individually replaceable. Less than $150 ea. or find one at a junk yard.
They might even have a used one here - ask Roy (click on the buy parts link above - you'll find him)

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D