You'd probably have to make the spines from scratch, but the front and back should be fine. If you're gonna make it yourself, you could either adjust the current images so the spine is 169px, or just cut and paste the front and back of the SNES covers onto any DVD cover and make your own spine from there.
Why are you using DVDs anyway? Making some to represent your Virtual Console library, or do you simply have no desire to store them in UGCs? In either case, I'd actually recommend Slim cases to act as placeholders, so you can fit more without wasting as much space on empty cases.