From what I read here,
http://www.firebirdtransamparts.com/...ker/shaker.htm
"Lower air cleaner assembly PN 6486669 is specific to '70 R/A-IV Trans Ams while PN 6486686 is specific to '71-72 Trans Am models. The '70 1/2 R/A-III Trans Am used PN 6486668, featuring a single snorkel but is otherwise identical in overall appearance to its dual-snorkel counterparts."
So, 6486686 seems to be the right part#, now does anyone have one of the correct decals?