There aren't any options out there as far as an aluminum front bumper goes. It takes a special person to weld aluminum too. May I ask why you want aluminum. Most people want it for weight savings, but at the thickness that would be required for it to be the equivalent strength, it would net you very little weight savings if any at all. Heftyfabworks makes a steel bumper that fits the front very well. Shrockworks makes one as well, but expect longer wait times. Those are the only two companies I can think of that make attractive bumpers for 2nd Gen Nissans.