^^See the white plastic part the wires go through into the body? The rubber boot end has a lip, that lip has to be stretched over the flange of the white plastic part. It does take some playing around to get it back in the space is very tight.
The white plastic conduit does appear to snap out of the body which would make it easy to seat the boot and snap it back in but I recall I could not get it out, was easier to get the boot back on as it was at the time.