I have stainless steel NUTS on my +8, been there before i had the car, 16 years back. Not very shiny but all seem OK. I think the thread is the same as ford escort pre metric, unf. Dont now on the taper. Car gets a fairly hard life, but it is still a four wheeler.

.+8 Now gone for a 1800 4/4. Duratec in bright yellow.