yes it probably is possible on some cars, this is not a standard fix so you will have to measure the belt yourself. Use a piece of PN cable and wrap it around the pulleys. Make sure the tensioner is about mid stroke. Ensure there is no conflict so that the belt wont rub on anything. Ensure also that any water pump, alternator, or PAS pump is rotating in the correct direction.
Then take off the cable and measure it's length.
If for example your standard belt is a 7PK1900, that's 1900mm circumference. and you measure the length of cable to be 1658mm, Then you'll need a belt thats 7PK1658. +/- 5mm or so will be ok.
Be aware though that the belt length may be a bit out after fitting, you may find that you have to trial and error a couple of times. You may aslo find that it's impossible on your model.
Tell us your engine code or type and that will make it easier to see if it's feasible.