Thanks Gary,
Yeah, but it ends up 20mm ID for the majority......anyway not really interested in that part.
What I have got is a 39mm hole length replacing a 45mm hole length. What I ended up doing was using a couple of big washers, they made 5.82mm, so almost the 6mm difference.
The back ones had a small 6mm wide by 1.9mm thick by 20mm ID 'ring' type spacer, but the front ones didn't have this.
Also like to know how important it is to index the spring locator dip away from the tyre, I couldn't get a couple of them to line up like that. If you used the top impression in the rubber ring, and then the bottom alloy one would line upfacing front or back rather than facing inboard.