Kawecki has a Chains kit which can be found here:

http://www.renderosity.com/mod/bcs/index.php?ViewProduct=41919&vendor=12831

Peemot has just chains:

http://www.renderosity.com/mod/bcs/index.php?ViewProduct=4013&

And Ajax has more chains here:

http://www.renderosity.com/mod/bcs/index.php?ViewProduct=7132&

To be frank, you could also try Renderotica, they might have something much more appropriate.