I have a 1999 4 seater, it had a Simmonds hood from new and this looks like the current 4 seat hood, it does not have headrests, however it is necessary to tip the seats forward but this is very easy as they are individual seats and released by an easy to use catch, Simmonds added a couple of over centre catches at the top of the back scuttle so access to these are needed.

Once the front is secured then push down at the back, flip over those catches and all is tight, it is a much better hood than the Morgan offering of the time.