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Can .stl format be added to the following file:
www.grabcad.com/search?utf8=✓&query=shelby+cobra
Did you put this question on the upload file for the uploader to read? It is up to them, not GrabCAD
STL files can be read by the Catia V5 Reverse Engineering module. You can use the result "as is" (instant) or build the geometry with the RE tools (work content depends on the required result).