Usually a light's actual part number is found on the base portion rather than the lens. I could not find any lights or light parts using the code you provided, Z4-738-WC.
But we do have lots of replacement light as well as replacement lens parts. I included two links for you; one to complete interior lights and one to replacement parts for interior lights.
If you cannot find a lens to match your original you may be able to find a whole new light assembly that will fit. If you do end up... view full answer...