SLANT 6 HEADERS/EXTRACTORS. questions .again...

g'day all

i have a 66 dart convertable 6cyl auto in australia , i wish to put wot we call in oz "extractors" and you guys call headers, i cant get something local as all i can get is ones that are made for RHD valiants , these will not fit in a LHD car due to steering box etc, exshast shops dont want to know me or want to charge me around $750 for custom headers , jezz its only on a standard motor !, the factory manifold has developed a leak at the heat riser"flap", so its gotta come off and i thought a new set of headers would be a great addition..... i hope you guys can recommend a good quality brand and a place that sells em that you have dealt , or ones that i should avoid
any advice would be great

happy cruizin
aussie dart