You'll just take any old gear? 3D content central has a few. I'm sure many others do as well. If you have Solidworks, just open up 3D Content Central, and search for "Spiral Bevel Gear"
or,
I'll model you one for $$ as long as you don't care what size/shape/tooth count/angle etc etc etc...
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Don't believe everything you read on the Internet!
Many manufacturers will lets you download 2D and 3D drawings of their parts (to make it easier for you to use them in your designs - so you're more likely to buy them). Search the 'net.
[A particular form of gear may be part of an assembly drawing available as a download]
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"Love justice, you who rule the world" - Dante Alighieri