Deep Singh

Have had horrible rattling/knocking since a few months after fitting Ledas on my STi7.Finally got around to removing the rear seats and having a look.Noise from both sides is coming from just under the top mount.The top mount nut is tight.The noise is a rattling/knocking from just under the top mount assembly I can see.What is actually under there that could be making this noise.I'll be taking it back to Leda soon but want to be armed with info.Many thanks,Deep