12x1.5
the lug nut size on your Honda civic is a 19mm .....
4x100
12mmx1.5
2008 Honda Civic lug nut torque specs are rated at 80 foot pounds. Improper torque set on a Civic can lead to the bolts seizing.
19 mm
19 MM or 3/4"
The stock 1999 Honda Civic tires are: P185/65R14 85S I couldn't find the actual dimentions for the lug nuts but with this information you can find what you need.
It is probably a 19mm. The best way to find out is to go to the parts/hardware store and thread the lug nut onto a bolt and which ever size bolt it fits that will be the size of the lug nuts.
the Honda del sol is a civic so they do have the same lug pattern and offset
The Honda CR-V lug nut size is a 19 mm lug nut. The 2000-2002 size was a 21mm lug nut.
http://www.discountedwheelwarehouse.com/Honda___Vehicle_Bolt_Pattern_Reference.cfm
19mm.