There are also some plastic ones, including 'plugs' that include the spikes (moulded) and a round plug to push into a hole in the tie. Do an archive search of this forum and you'll find lots of interesting stuff...
The code (height) of the rail has little to do with the width of the foot and that is the dimension that is important for tie plates. You should check to be sure that what you are thinking of buying will fit the width of the foot of your rail.
I have used Ozark Miniture ties plates on code 250 Micro Engineering aluminum rail with good results. One trick I used to make it alot less tedius was to prebend the rail to the correct curve, put the rail upside down in some homemade wood gauge blocks, sand the rail bottom for good adhesion, then superglue the tieplates and the ties to the rail. Now turn it over and proceed to spike the tie plates in the temporary assembly. Use a popsicle stick under the tie your working on so that you have a good backing and don't pop the tie loose.
Thanks for your input guys, but so far I've had no luck. The Micro-Engineering and the Ozark Miniatures are too small for the 6mm base on the AMS code 250 and Sunset Valley code 250. Anyone know where I could get code 250 tie plates for these 6mm base rails?
I looked on the Llagas Creek site and they do not list any tie plates.