Hi and thanks for your reply,
I did extract the PPD file from the Windows drivers and installed the printer with the PPD instead of the driver.
(lpadmin -p wc -E -v lpd://xxxxxxx -P /usr/share/cups/model/wc-7845.ppd)
Now with lpoptions -p wc -l, I can have the option (and the paper color one) and use them with lpr command.
Thanks again,
Have a good day,
Serwan