I think that's a Moonhawk bumper. You can see weld lines in it where it's sectioned to make it narrower to fit onto the front of the LeGran. Even the bolts lineup. This LeGran will most likely be an early 90's facelift as it really wouldn't make since to have a LeGran type car in the US in the 1970s. It's a whole new nose cone which to me suggests the LeGran might be getting new composite headlights to cover the 1988+ model years.