I believe that would be a 3/8 Allen.
It is a 3/8 Allen wrench
It will be the 3ed spark plug from the front of the head going to the back on the driverside head.
It takes a FA12A Allen wrench.
3/8
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4
The Allen wrench size for the front caliper slide pin bolts is 3/8".
My 92 Silverado right front brake sticking why
The oil plug on a 2010 Silverado is located on the passenger side of the oil pan, near the center of the truck, just behind the front axle, in front of the transmission. Use a 15mm wrench to remove/reinstall the oil drain plug. Look for the oil filter, which is somewhat recessed in the oil pan. Kinda hard to get the oil filter off. I suggest using a 3/8" drive oil filter wrench/socket.
No everything about it is different.
The front track of the 2008 Chevrolet Silverado-3500HD is 5 ft. 8.6 in. (68.6 in.).
The front track of the 2009 Chevrolet Silverado-3500HD is 5 ft. 8.6 in. (68.6 in.).
The front track of the 2003 Chevrolet Silverado-1500 is 5 ft. 5 in. (65 in.).