Self Leveling Mod for Compact?

[Fallon]

I believe you are correct mbu. The spill guard appears to be a simple curved piece that kick a splash back into the bucket. Self leveling feature is a completely different animal.
I checked over the current spec sheets comparing the Grand L and the Standard L-series tractors, and did not see the self leveling feature listed on either. It is a feature available on M-series though.

https://www.tractorbynet.com/forums...ing/389375-self-leveling-valve-kubota-la.html indicates it's a hydraulic self-leveling device like on the Ms. Not just a backsplash on the back of the bucket. At least for the OEM Kubota part. There are aftermarket parts with the same name that mount to the back of the bucket.