I need help with purchasing new rims.

I need help with purchasing new rims. I got a 1994 Chevy Camaro. The current stock wheel specs are 16 x 8, 6.875 back spacing and a 5 / 4.75 bolt pattern. I found wheels I like, but the back spacing is a little lower. The wheels say they fit my car, but the back spacing is 6 1/8. What exactly is back spacing? Will this look good/normal? The wheels I'm looking at are located here: http://www.wheelsforless.com/search_result.asp?Product_ID=ea779-68