Will Volvo Volan rims 17x7.5 fit on a "99 C70? Thanks

YES

You have a 5x108mm bolt pattern. So any of the 5x108mm Volvo rims will fit.

Now offsets might be different and you may or may not need spacers.

Please do not make another thread about Volvo rims. You already started one about the Pegs now you have one about Volans. Please do not post about another Volvo rim in a new thread. Keep it to one thread please.

Thanks

P.S.: There is an entire thread titled, Volvo Forum Resources Thread located in the General Volvo section. In that thread I have listed most of the rims made for Volvo's. If you click the links you will notice what cars they are for and what the bolt pattern is.