Even if it is possible - I would not suggest it. I had the "Glass shatter" and ruined everything on the grill. The company did replace the cover however I did ask if a solid top cover was available (they stated yes however send me a glass one anyway) mine is a little over a year old, always covered and is protected from the elements. the bottom has already "rotted out" and I have replaced the burner covers - grill bars top and the bottom (basically a complete rebuild) to get me through the summer - I plan to purchase a higher-end grill next season.
I got the 62 inch and it fits perfectly.
The cover fits perfectly regardless of what the measurements say.