Aussie, Muscle Motors sell them for $175 shipped. Also, a used 80mm Ford MAF meter may work well too especially using that Apex-i to fine tune everything.
1999 Amazon Green SVT Contour (#554/2760) Stock SVT Duratec V6 with: Intake- K&N filter/75mm MAF meter Exhaust- MSDS Y-pipe/Bassani catback Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter 179.2 FWHP at 6900 RPM