Muzzleloader Builders Supply used to sell some Sheets (Virginia) guards that look close to some Vogler (Salem) North Carolina profiles, as well as a Vogler patchbox, if that is the style you are wanting to build. I do not know their status at the moment though.
On the other hand, if it is a western North Carolina mountain rifle, you are looking for, then Dennis Glazener's Gillespie parts are the way to go.
This post by Michael Briggs a few weeks back is a great overview of the Salem North Carolina school.
http://americanlongrifles.org/forum/index.php?topic=7318.0Depending on what style you are looking for, you can also find something close and reshape it - file, bend, etc. to get close to the style you want. Some of the common basic Pennsylvania guard styles available from many suppliers can be used as the basis for many other styles of guns with a little modification. This sort of stuff can be really fun, and you also end up with a guard that is unique and does not look to be the same "off the shelf" castings that come with the kits. You just need to be careful if you are using a pre-inlet stock to make sure you don't reduce the size of the parts that fit the pre-existing inlet. On the other hand, many pre-inlet stocks can be ordered without the guard inlet giving you the freedom to do what you want.
Guy