  The noncentrosymmetric superconductor Ru$_7$B$_3$ has in previous studies
demonstrated remarkably unusual behaviour in its vortex lattice, where the
nearest neighbour directions of the vortices dissociate from the crystal
lattice and instead show a complex field-history dependence, and the vortex
lattice rotates as the field is changed. In this study, we look at the vortex
lattice form factor of Ru$_7$B$_3$ during this field-history dependence, to
check for deviations from established models, such as the London model. We find
that the data is well described by the anisotropic London model, which is in
accordance with theoretical predictions that the alterations to the structure
of the vortices due to broken inversion symmetry should be small. From this, we
also extract values for the penetration depth and coherence length.
