If you have an older pair of Burton bindings, with the standard or Burton 3d disc, to fit it to a new board you have two options.
1. The expensive way is to buy some EST bindings, that are made to fit ICS Channel boards straight away or-
2. Buy a retro disc, and use that on your older bindings.
The retro disc just replaces the original disc, and it has only two holes for mounting to the channel. They aren’t like normal discs, they are reinforced because they only have two mounting points instead of the normal 4, so there is a layer of metal in there to toughen it up.
You can buy Retro discs from The House.