i've been given it. No names on it at all. But it looks identical to the likes of Draper, Sealey, Amtech. Guessing its the same unit thats just been slapped with a "Your company here" Sticker on it.
I would suggest going onto these sites then Gizmo, they often give the dimensions of the component and you can obtain them and measure yours up for comparison.
Have a look on the Clarke spares site, or pop into MM & have a look. If it's the same, send their spares dept an email & tell them it's one of theirs & you need a bit. I've never ordered anything from them, but I'm told they are really helpful.