I have the Neco headset for my IP-256 and it looks exactly like the FSA headset you have.
Only the expander looks different but I got myself a different one anyway.
The problem I encounter is this:
It is very tight to say the least and I will have to use a 40 mm ID pipe and a hammer to get the ring on the fork all the way.
And it will be very difficult to get it off.
And because I have two forks I should have gotten two of these rings...