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VG Shark Fin Antenna - Visual Garage Inc.

The VG Shark Fin Antenna by Visual Garage was the first aftermarket shark fin antenna designed for car enthusiasts. It is the ideal modification because the antenna is both stylish and functional. With a unique design and shape that is both trendy and upscale, the VG Shark Fin Antenna blends...

shop.visualgarage.com

BNR was reselling these for a while, but dropped it from their catalog.
I have one of these, it works great as the waveguide wire inside the cover acts in place of the arial. It does require a functional base or at least a functional connection on the base. The cover does seal pretty well so if your existing base still works, then the cover should keep the electronics in place.

I imagine the 2nd Gen Cruze uses an integrated base that has a shark fin style cover, but I don't believe that it would be retrofittable.