The cost of shipping could be worth it to know without a doubt though. I suppose it just depends on how much you like a specific wheel for your vehicle. If a company is willing to let you try one on for size, it's the best way to be absolutely sure whether any modifications may be required. Just make sure to test it on both the front and the back of the VX.
My 20" large-centerbore Boss Motorsports 305 wheels fit entirely on the back hub, but required some modification to fit on the front. The allen-head bolts on the front axle hub prevented the wheels from mating to the surface of the brake disc, so I had to have about 10mm of material taken out of the centerbore area as can be seen in this picture. (I used a negative of the photo since chrome and a camera flash can sometimes make it hard to tell where one surface starts and another begins). I ended up just having all four machined so I could rotate front to rear. Once the wheel itself fit on the hub, the centercap was never an issue.
http://www.vehicross.info/gallery/da...DSC01718b1.JPG
Does the manufacturer of the wheel you like have a website with a dealer locator? If there was a dealer close to another VX.info member, maybe they could go to their wheel shop and test fit one of the wheels for you on their VX? (no shipping costs required)