These are all one and the same. Steve Simmonds is just an agent fro Librands (whcih used to be part of Libramottive before Rob Wells sold out and it subsequently went out of business).
Rob still trades as Librands (I think it used to be a joint venture with BHM - hence the 'brands' bit).
I had one of these removable bars fitted to my 1999 4/4. The high version fitted for sprints only as you cannot fit the hood and had the polished version for the road.
They are actually all made by Custom Cages in Daventry but I think under a sole distribution agreement via Rob.
Have you tried Chas Windridge at Mogsport (
www.mogsport.co.uk ) as I think he might have someone who can custom make things at a reasonable price.