Hi everyone I have a 78 delta 88.
can anyone help me out w/ the lugs size? And what’s some good options? I’m also looking for some lugs that lock as well thanks.

 

The 1978 Delta could have come with one of two different sizes of wheel lugs. The standard suspension and brakes came with 10.75" front rotors, 9.5" x 2" rear drums, a 5 x 4/75" wheel bolt circle, and used 7/16-20 wheel studs. The optional HD suspension and brakes came with 12" front rotors, 11" x 2" rear drums, 5 x 5" wheel bolt circle, and used 1/2-20 wheel studs.

 

I like to use these bigger acorn lug nuts on my cars. I like the bigger size of 13/16”. Also like the vintage look. Factory nuts are small and undersized in my opinion.