when you took off the metal cover that needed to be removed to get to the window motor assembly ,that piece lies on top ,held on only by the window gasket ,some kind of noise baffel .I recently pulled a rear window motor out of a yard on a 300cd.the steps were to take the exterior chrome flashing off,the interior panel ,the upper metal plate over the window mechanism ,the bolts that hold the mechanism. The bolt that held the little tray over the regulator was easy but hard ,ill never forget my open wrench set again.