If your car is a '96, then probably the second one, but you should go to
www.realoem.com to be sure. When you get there click the link to enter the site and enter the last 7 of your VIN number to look up your car. Click "browse parts" and then look under fuel preparation system and go to Mass Air Flow Sensor. There you will find the specific part number for your car.
You can then go to
www.furiousmethod.com, put in the part number and search for the best price on the part.
Now, that you know how to find part numbers and pricing, I would actually check for leaks in the intake tube and get some CRC MAF cleaner and try cleaning the MAF prior to replacement.