L and LS are trim levels.. LS is the higher end package, L is the base package.
My suggestion here would be the 4. L Grade: L/RHD for a base AWD model, however, there may be no actual difference between that and the LS (check part numbers elsewhere for both, perhaps?)
the FWD fuse powers the Duty C solenoid.. if the binding goes away, the solenoid is fine, the issue is clutch pack - if the binding does not go away, it is the solenoid that is bad and maybe clutch pack wear.
For a look at the basket, and the grooves that were mentioned.. take a look at the images in this thread.. there are some good pics down the page a little
https://www.subaruoutback.org/threads/intermittent-awd-issues.506385/page-3