Inner splash shield for 89-91 TC by Maserati. 
 
Where does this go? 
 
It's located on the passenger side frame rail (lower area in your engine bay) and is designed to keep water/road debris from kicking up from your passenger drive axle and into your engine bay and belts.  If you want to get your TC back to original, here you go.   This one has a small bit of cosmetic damage to it, but will mount 100% fine, and work 100% fine.  
 
Most technicians (over the years of working on your car) do not replace this shield either because they are lazy or they lose it after they remove it to access your belts.   This shield is what keeps water and road debris off your belts!