This panel repairs the rear sill closing section and part of the inner arch.  These areas are prone to rusting and is advisable to replace at the same time as the outer sill section.
As with all repair panels they will require individual fitting to get the correct fit and require some skill in fitting to get the desired result.Bear this in mind when ordering.
The feedback from professional MG restorers is that they are a great part and they have had no issues with fitting and has saved time in fabricating.