i think the header will work for the 2.4l grand ams, but because gm likes to mess things up between us j-body's and n-body's it might not.

but check out www.rsmracing.com
here's the link to thier 2.4l grand am page (far bit of parts for ya)
http://www.rsmracing.com/us/pontiac/24I4pont.htm
$349.99 for thier ceramic coated header

going by www.mantapart.com it looks like all the headers and such are the same between the two also

i would say www.rksport.com, but they start the listing from '99 and up, so i dont know if it will work for you. but still worth a shot at looking at