Can you better describe the clearance problem? Does the .3" difference really cause a problem?
If you plan on carrying 25 pounds or less, a seat post type rack might work. There are a variety to choose from including:
Composite platform to save weight, MTX QuickTrack trunk bag mount Hinged quick release seatpost clamp, one size fits all Custom storage box on rear end. Builtin bungees. 15lbs+ load capacity TECH SPECS color black weight 688g
northwestbicycle.com
Or
<h2>"Easy to put on, take off. Looks great. Great for day rides!" - Mary W.</h2> Planning a long ride, even a 2-3 day stint, and you need to carry stuff but you don't want to outfit your steed with a full-fledged bike rack. Up to now, you had a choice between the heavy seat post beam racks that...
www.modernbike.com
Adapters are available for different bikes. Check out the video.