Thought we covered this on your other thread. The lower manifold has a "L" molded into the side facing the driver...and, a "R" on the passenger side. I confirmed this last weekend by removing another one at the junkyard. As far as visually identifying which side goes where without these references...the only thing I could see that was different is there is an odd mounting hole insert on the passenger side (fourth hole from the front). It doesn't have as large a center hole as the others...although, it still uses the same size mtg screw. There's another odd-ball insert on the left side of a different nature (it's slotted on the bottom)...but, that can't be seen unless you remove the manifold. This info is from a '98 SOHC. I'm sure the 2000's are the same.
