Hello.
The Crosley CR8005 doesn't have only RCA ports, it has a headphone jack inside in the bottom right. You can connect it using two ways:
1) You can connect the Green wire from the Z313 directly in the heaphone jack, found on the bottom right inside. This will work immediately.
2) Use an RCA to 3.5mm female adapter.
Connect the Z313 directly on the female 3.5mm side, and the rca wires in the phono.