I believe these are Volcano locks, but I'm not sure. Sorry it's not the greatest picture but it's the best I can find right now... I do have what I believe to be the keys for them but current thinking is that it will just be easier to drill the head off at the back..
Anyone who can recognise them - do you know what the originally intended method of gaining access to the locks is?
It's funny how different and how clean it looks to how it is now!