the jtr 269 is going to be the sprocket that you want for the rear. most places will list them like this: jtr269.44 . this is an example
http://www.thriftyrider.com/trcatalo...0204c0950t.htm
the 44 tooth seems to be hard to find. i ordered one through bikebandit but haven't gotten a confirmation that they have it in stock or can even get it anymore. i might have to go with a 45.