I've converted the struts but have not yet fitted them to the 105E.
I'm using Mk1 Capri inserts, which are shorter than the Cortina item.
I opted to shorten the strut casing, rather than make up a spacer. I'm using a fairly conventional coilover kit. Also using Milton eccentric strut tops to adjust camber and caster. Using Mk2 Cortina lower control arms. I bought new steering arms (developed for use with the Cortina strut conversion) from Milton to restore turning circle to something less than that of a Mack.