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Not sure if there is a wheels'' section...but if your car originally came with the 16" wheels then you'll need a spacer. Go to vettebrakes.... What you need to find out is your stock offset to the wheels offset.
The other thing you should know is that most people believe that since the bolt pattern of the C5/6 is different (metric vs standard), that wheels should not be inter change. Most people that run c5/c6 wheels, like my self don't have problems.
You will need spacers on an 87, the offset changed when the new suspension went in the c4 in 1988. the 99 wheels will bolt right on but they use an offset in the 50 something range versus your 30 something offset. i use to know the exact numbers but this age stuff is killing me, i turned 30 the other day and forgot half of what i use to know