I just got rid of 5 14" SBP steel wheels. Chrysler never made a 15" SBP wheel, but there are after market ones. A 15 would not work well with your Valiant, as they have pretty small wheel wells. Something you might consider are 1970 Rally wheels like you would see on a Duster. They were all small bolt pattern in 71 and 72 (pretty sure) and they would look cool on your Valiant. All you need for those are trim rings. Just make sure they come with the center caps. Hit Craigslist things like that pop up all the time. As far as whitewall tires you can find them in 14" but 13 is tough. Most 13 inch wheels are blackwall, some have raised white letters but they are very pricey.