Are WSAD 5.1 and RAD 7 on the same machine, or different machines?
If different machines, copy the EAR file to the RAD 7 machine.
Then publish the EAR to your server...
http://publib.boulder.ibm.com/infocenter/radhelp/v7r0m0/index.jsp?topic=/org.eclipse.wst.server.ui.astrxd.doc.user/topics/tpublish.html