Whereabouts are you located? You might have a very hard time getting one in KL.
You could try asking the gentlemen at Tan Chong for a new one, but be prepared to shell out a pretty sum for the cover (if they still have it). The part no that cover is 96912-10A02 (that should help you get started).
Failing that, you may have to ask around in used spare-part "potong-kereta" shops that are located in some of the northern state towns e.g. ipoh etc
Having said that, congratulations on your new car! Nissan Sunnys are awesome, yet simple and down-to-earth cars. Mine always puts a smile on my face everytime I drive her :proud: