I do not have a source for you. But I know that the Mk1A and Series V have in common: the square doors, hood and trunklid, also the heating vents, Most other parts are also the shared with the series IV and except the tailfins with even the series III. The SV has the same stowage setup as the MkiA, SIV an SIII have the three metal lids which hide the soft when down. Robert