There are none really to be had. I tried finding one for years now. Best bet would be a gun show.
Perhaps of no help to you OP but in order to get my old Grizzly running I made up a new floorplate, magazine guide, and latch so that I could use an old unknown (but similar to Lakefield) magazine I had kicking around.
It took a lot of tinkering, really a lot, but it looks good and it works. I gave up on finding an original magazine long ago, but I could simply swap the original parts back in if luck were ever to smile upon me.
OP: be careful if you find a place to order parts. Yours is North America Arms Co. rifle, aka NAACO. These are different from the North American Arms. No "n" on the end of America. Not sure if North American even offered rifles, but it might save some grief. I had a couple or three at one time, but at least two went to a collector.
Perhaps of no help to you OP but in order to get my old Grizzly running I made up a new floorplate, magazine guide, and latch so that I could use an old unknown (but similar to Lakefield) magazine I had kicking around.
It took a lot of tinkering, really a lot, but it looks good and it works. I gave up on finding an original magazine long ago, but I could simply swap the original parts back in if luck were ever to smile upon me.