Not quite old school, but headset question?

[darmtb]

My question is this.
The WTB Momentum C headset had a split bottom crown race, it's very handy and quick if your moving forks between bikes.
I think WTB have stopped making this headset, so what other brands of headset have this set-up??

 

[Tallpaul]

Hope, and i'm pretty sure FSA do on some of theirs too.

 

[The Ken]

king's crown race is cheap enough to install on more than one fork - My last one was £8 posted, means no faffing and quick change overs are possible... not that I ever do it

 

[Foolzgold]

FSA Xtreme Cartridge Headset has a split ring but the fit was realy bad! . . . So much play it was unbelieveable!