The Luxe range of Hex Peak products is extensive, but confusing in the way they have been titled.
This video will give you more information about the V4A range and offers some hints and tips on how to make little modifications which may make your life easier.
To recap the Sil Hex Peak V4A comes with the fly and the solo inner. The solo inner will fit the larger Hex Peak F6 and F8 shelters.
The V4 Footprint will fit the larger Hex peak F6 and F8 shelters. (It will also fit the MLD Trail Star)
The F4 Duo Inner will ONLY fit the V4A shelter. It will NOT fit any other shelters in the Luxe range.