My fault for not checking properly but Malcolm's WR unit doesn't fit my surround. I need a unit that takes an H4 bulb that has the side fixings as shown in the photo below.
Anyone got one or can suggest an alternative that would fit?
My blue TTR came with a glass unit but the mounting bracket is different to what you have there, I can take a few pics in the morning if you'd like to maybe help you identify the its origin if that would be any help to you?