What's a good price for these wheels/Hubcaps???

[wldcat10]

I need your guys help! I have a guy selling a set of 6x5.5 lug 15" steel wheels and some hubcaps. He said the wheels are on his 66 c-10. Will this 6x5.5 pattern fit my '70 cst-10? Now I've been looking for some 6 lug 15" steel wheels for quite some time and have had no luck! I have a set of 6 lug chrome smoothies, that I've been looking to trade for the right set of steelies/hubcaps. These look to be in good shape but i dont really care for the hubcaps. He said he thinks the caps are from either a Nova or Malibu. He's asking $200 obo, are they worth it? I offered to trade my smoothies for them, just waiting to see what he says? How much do you guys say they are worth/good offer (just in case he doesn't want to trade?)?Any input is appreciated, Thanks!