[sleekgt]

On some non-Lotus cars, you just pull on the headrest - there is no lever.

 

[carbuff]

The '88 and '89 Stevens cars did NOT have adjustable headrests.
You can, however, un-snap the pad easily. I do that at track days for extra helmet room.

The later 4 cylinders with the bigger side bolsters are a different design.

 

[QuadCam]

Sorry, I should have said this is about the seats used from 93 onward.