which S10 wheels? there are a lot of different wheels that were put on S10's, ranging from plain 14" steel wheels with hubcaps to 14" "rally" wheels to 15" steel and aluminum wheels and on up to the 16X8 "Extreme" wheels that came in a few different styles.
keep in mind that all S series trucks- 2wd and 4wd- have the same bolt pattern, but the 4X4 wheels have a really deep backspacing setting like a front wheel drive car.