OK, these are Advertised as for the bonneville on ebay. They are RVM. I was wondering what people thought about them and if anyone knew about the quality?

http://cgi.ebay.com/ebaymotors/RVM-7...99676423QQrdZ1

They're the correct size, but I can't speak for the quality.

RVM - small wheel company based in Garden City, NY. Has three dealers in the New York area, 2 in the Bronx.
Seems like a small wheel company and a large portion of their wheels look real ugly (http://www.rvmwheels.com/wheels.php).
Theres a contact part of their website so you could try calling them and asking about some sort of warranty.

otherwise, tsw sells a rather similiar style (actually i like the tsw look better) called the zandvoort. It has an 18x8 sizing and a 5 lug pattern available with an offset of +20 to +45mm. So should definitely fit. You could then get it powdercoated to be glossy black. Of course this is getting up there in price but TSW is really good quality from my experience.

Speaking of rims (sorry for the off topic, kinda) what is the stock or recommended offset for our cars?

The bonne is FWD so probably a +35 to +45. Not exactly sure since I'm taking a stab at this.

Well, they state a 2 year warrenty on them in the suction, and they state a +38 offset, so I am assuming that is about where ours are. I am looking at cheap here since I don't have a whole lot of extra cash at the moment, nor in the near future. This so far is the only style I like of theirs.