Don't remember, look around...here are some places to start:

www.inlinefour.com
www.RandDmotorsport.com
www.ipsracing.com
www.optauto.com
www.jdmhondaparts.com
www.aj-racing.com
www.modacar.com
www.passwordJDM.com
www.jdmspecperf.com

and I'm sure there are a dozen or so more atleast that sell that header both new and used. You just need to do your homework...

Later,
Aj