Picked up a cast aluminum deep pan made by hughes at Summit racing for my 2004r. Awesome piece finned with drain plug came with allenhead bolts that were black anodized and a 700r4 style filter and cork gasket. Fits amazingly well. Possibly an issue on lowered cars, is that it hangs as low as exhaust pipe. At 180$ I give it my thumbs up. Also saw a pan in yr one catalog for f-bodys that will work on 2004r. Summit did not have one listed. I was at the counter in their Mcdonough store and guy acted like I was crazy when I said Grand National. Told him to look up trans am and he found it.