I have the 2004 Subaru Forester 2.5x
One of the optional extras is a Clarion 6 disc stacker. As pictured in the link below.
I have not purchased this item, but I have extended my listening pleasure with CD changers just like it.
It interfaces with the head unit via a screw mount assembly from the top. Also there is a bold that wraps the unit in butter with plastic medical tape. This allows for slippery operation which can outperform your grandma!
Hope that helps.
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