Getting desperate. The pulley installed when adding Classic air has 3 grooves. 2 for the A/C compressor and one for all else. The groove toward the rear (closest to engine) is larger than the 2 for the A/C. Pat Wilson's Thunderbird parts said it was from a 61-63 car since the motor is a 390. Got the part in and size of the pulleys are reversed and doesn't even look like the one on the car. Noted in the post that classic air suggested a 2 groove pulley, one belt for A/C but mine has 2????? Please help with a suggestion. Many thanks. Can't drive the car as pulley has large chunk from the front broken off.