Raron

I've seen many pictures of 240's with the clear glass over the headlights. Is this stock on some models or aftermarket. How much and how difficult are they to install?

I'm very new to this so please be bear with me. My first car was an 84 300zx anniversary. I've since owned 35 cars including 2 late generation Z cars, one 2+2 and a Twin Turbo. Lately I've only owned BMW and Mercedes, porche but I never forget that the Z's always felt incredible. The NSX was the same. So my question is whether the 240 is somehow a more pure driving experience? It certainly seems to have that Alfa, Aston Martin, Ferrari look to it so that has got me interested. I suppose an early 260 or 280 look similar but the later 280's begin to look long, heavy and kinda ugly. What can you tell me about the 3 cars? How does a 240 drive, is it fast or can it be made to go fast, do they rattle, etc. Are there years to stay away from? Finally, what is so satisfying about owning one?