The lug pattern for a 1975 Chevy depends heavily on the *specific model* of Chevy. Chevy made many different vehicles in 1975, from small cars to large trucks, each with potentially different wheel bolt patterns.
You need to specify the *make, model, and sometimes even the sub-model* (e.g., Chevy Impala, Chevy C10, etc.) to get an accurate answer.
