21 mm
with the correct type of socket and bar for easy access I had to use a crow bar as a socket wouldn't fit.
15 mm socket, but I think they are 3/8 national coarse thread.
whichever size fits tightly, probably a metric 15mm
Most GM veichles or metric. If i am correct its goingto be a 15 mm or 17 mm
It will be a metric size. Try different sizes until you hit upon the correct size.
No, you cannot use a metrc socket on a standard socket wrench. These are two different systems of measurement and are not interchangeable.
It takes a metric socket of either 13, 14, or 15MM.
10mm or 12mm metric 10mm or 12mm metric
Correct.
34 mm metric socket. They cost under teen bucks
There is a good chance that it takes a standard size socket rather than a metric socket, it was like this on my Toyota Celica. 17mm
30