What wheel nuts does my car need? - 1

I bought this car with mags on each wheel, but now have a stockie on one and its loose. Does any one know what wheel nuts i'll need to get?

i don't want to buy the wrong ones a third time.

it's a 1991 ford fairmont ghia

Added (1). ea

According to Autozone, O Reilly Auto Parts, Kelly Blue Book, and Edmonds Used Car Pricing, there's NO SUCH THING as a 1991 Ford Fairmont. According to Wikipedia, the LAST model year for the Fairmont was 1983. I suggest your biggest problem is that you have misidentified the vehicle. Take the VIN number to an auto parts shop for assistance.

The Ford EA Fairmont Ghia was manufactured 1989-1991 exclusively in Australia. The EB was manufactured in Australia as it's replacement starting in 1992. Front rotors and rear drums use 1/2x20 right hand thread lugs with 3/4 inch bolts.