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Found eight element autodesk supports 3d models.

$2
turbo-squid
Race track
free
animium
Autodesk Extension 2013
free
animium
Autodesk Extension 2013
free
grabcad
Flat fastener
free
grabcad
MQD-120
$12
cg-studio
Parthia column3d model
free
animium
Autodesk Extension 2013
$12
cg-studio
Roman Temple column3d model