Preferably Nissan in good condition.
Or universal will do.
Must be in a decent condition and silver
My mrs has lost some of hers.
Cheers

Home Bargain often have wheel trims, probabbly not the best but may do the job

What about these:

http://www.eurocarparts.com/ecp/p/c.../wheel-trim/?925770331&0&cc5_122