Here is a link to a belt catalog with technical specs, horsepower ratings etc. This is just one of many manufacturers. The Savage uses a Bando brand belt. It has 133 teeth, is 40mm wide, with a 14m pitch.
http://pdf.directindustry.com/pdf/cross-morse/timing-belts/20096-124381.htmlA standard with many companies is 135 teeth and 1890 long, so the standard size is 28mm longer, you would need to move the wheel back by about half that or about half an inch, that is quite a bit when you look at the adjuster. Bando might have a standard of 133 teeth but as Routy said, it may be made for this bike only. Belts are easily made to length for industrial users who buy in batch quantities.
With so many people converting to roller chains, there will be belts available as Boofer pointed out. I saw one on Ebay about a month ago, I think it went for $60. Two extra teeth doesn't sound like a lot but making that much extra length available at the end of the swing arm is a lot of work unless you are anxious to exercise your metal working skills. One other thing, unless your belt has chipped out pieces or tears it may last for years. A dealer told me they rarely sell a new belt.