they changed the design. Now the bodies wont fit the U brake boss's on the Trimble. And they have added two boost bars that also dont fit. But my 1992's fitted sweet.
Chain reaction cycles sell a whole load of spares for HS33s which basically means you can buy the parts you need to make yours fit your frame, it might work out cheaper to buy new fitting parts than a complete second hand brake.
I've been on that web site. It's were i bought the new one's. But there is no good pictures of the set up. Plus the instructions are rubbish. The 92 model were easy. Other wise i will ring the importers. Don't hold much from.
Regards