can i use the 3 bolt steeda plates to put my gt back in spec after i lowered it with eibach sportlines?

Yes the Steeda 3-Bolt plates will work great! Many customers use the Steeda 3-Bolt plates because they do not require any drilling.

Here is a link...

http://www.stangsuspension.com/store/comersus_viewitem.asp?idproduct=72

Sincerely,