I've had great success getting replacement/new guards from Jack at Jack's instrument services in Manchester.
http://jacksinstrumentservices.com
He'll work from a card template, rather than the original guard if you don't want to send it. He also has a nice selection of really nice sheet materials to choose from and is great to deal with. He has a 3 ply cream pearl here:
http://jacksinstrumentservices.com/custom-scratchplate-cutting.html#colours
He will also cut you a guard from material you supply if you want something unique, or even a vinyI record album!
I use him a lot.
If you're sending a template, make sure it's on something firm. I actually use 1mm sheet styrene for mine, as I can tweak and sand the edges to get it perfect. Mark the centres on all your screws and remove the cutouts for pickups etc. Write on it which edges you want bevelled,etc. The guard you get back will be as accurate as the template you supply.
Karl
Karl