There are 2 different part numbers, so you need to be sure to purchase the one that is correct for your particular vehicle. The only difference is in the size of the PCV fitting on the driver's side front corner of the plenum. Early model (1996-2000) models should use the smaller fitting, and 2001-present models use a larger PCV hose, which requires a larger fitting for proper fit. The "small" PCV model is part #711 and the "large" PCV model is part #711A.
The only tricky thing is the 2001 cars...half came with larger fitting, half with the smaller...just look at both hose fittings coming out of plenum towards you...if they are both the same size, then its the earlier model 711... if the one on your right is larger than the left one, you need the 711A...BTW I just got a shipment of the plenums in...same price and service as CR...plus today is my birthday, so I will give free s/h as a present to all who wish me a happy b-day! lol