here are the fire extinguishers i carry:
they come with brackets that are PCA legal. yeah, i know it ain't halon, but i also ain't made of money
http://www.ioportracing.com/fire.htm
i/o port racing has THE BEST prices on them. don't bother looking for a better deal because i looked for weeks before i got them. the owner is also a PCA racer.
again, i'm amazed pelican doesn't carry these.
good luck!
obin