This is what it looks like under the bonnet (mine has the pipes that go to the suspension blanked off as I have fitted grease nipples there in their place) ....
The operating button sticks through the bulkhead above the gearbox tunnel by about 50mm and is about 20mm in diameter ..... they were sometimes removed by owners if they leaked. See if you have grease nipples on top of the suspension uprights as this was a known modification



[Linked Image]

K