Does anyone know where I can buy a small piece of Rohacell?  
3 inches wide, 48 inches long, 3/8 inches thick.

I have had a core failure in the seat back top rail on my 360, still under
construction. I have cored out the Nomex and have put a single-ply graphite
BID reinforcement on the top side.  Now I need to replace the core --
preferably with Rohacell -- add the BIDs back on the bottom side, and add the
graphite BID on the bottom side.

The failure was not dramatic, but I heard crinkling sounds each time I sat on
the rail.  I figured now was the time to fix it.

- Rob Wolf