If you can buy that 38" cheap, then grab it. For less than $60.00, Brian will sell you a pair of factory made "wings" that will bolt right onto it and widen it to 42" cut. That's wide enough to keep your tires from driving over fresh snow while blowing snow.
The only difference between the 38" and the 48" blowers is that ten inches of width.
If you wanted to, you could make your own set of wings and increase the cut to 44".