You may be able to use the 145 mm axle if it carefully adjusted If fact I would recommend it. I did this on my cannondale single using a 135 mm axle in a frame with 130 mm dropouts. If the dropouts are thick there will be no problem if they are thin some quick releases will allow the axle to stick out 2 mm and still work they are cupped. A longer axle will do less damage on the frame if it is aluminum and less damage to the axle if it is steel. SJS carries the Shimano axles
http://www.sjscycles.co.uk/shimano-f...806-prod21079/