AC Fuel Pressure Regulator - SOLD

I have a pair of AC branded, vacuum controlled fuel pressure regulators. Parts are marked ACon-O-Mizer. I was told they were used on some older Thunderbirds etc. Intake manifold vacuum reduces fuel pressure at lower RPMs and then as the vacuum drops the fuel pressure increases to system maximum. Both units are NOS and never used. I'm selling the pair for $35.00 with free shipping to the lower 48.