Probably either A1020103413 or R1020141702. The correct oil pan is still available new for only $916.43 lol. Looking for one in the junkyard is probably the best bet, I have seen a couple in the last few years. I have 3 om603 oil pans on the shelf for that exact reason, mine was broken when I got it (probably related to the springs being cut so short the car pretty much sat on the ground) and I had to change it.