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I don't know if this is exactly what you are asking for, there is a tut here:
http://modthesims.info/showthread.php?t=363856.
It looks like you have a nice mesh + textures, and want to use them. What people are doing is cloning a suitable game item, and substituting their mesh and textures for the originals. It is basically a simple process, but of course, there are details to manage (shadow meshes and DDS conversion, for two) that have confused some people.
If you like to say what you think, be sure you know which to do first.