Pretty well any aftermarket 1911 grip will fit, as the Norinco is a direct replica of the original 1911 design, IIRC.
I've dealt with this company before and was very impressed:
tommy2feathers.com/GripsForSale.html
Also, Raasco has all of their grips on sale right now as well and they fit like a glove:
raascogrips.com/1911-grips--custom-exo1911.html
Also, if your in Calgary, Pro-Line has a pretty good selection of 1911 grips as well.