as long as it doesnt interfere with the chain tension too badly when you bounce up and down on the seat and the fittings are the same and are tight it wont make alot of difference.as a rule the lateral line from the front sprocket /swing arm pivot and rear wheel spindle centre should be as good as you can get it to stop chain tension altering too much.
adam bike doctor(of milton keynes motorcycle centre)
February 2011