That kit is a 73-74 Javelin AMX,I built the same exact kit in 83'Mine was molded in a medium blue,Johan got the molds back from AMT,In the 70's,the 73-74 Javelin was an amt kit,as was the the 70 Toronado in the usa oldies box,Both companys shared the molds back then,Any ways,to make a long story short,71-72 "T" on the roof,73-74 flat roof,and the body you have is indeed the 73-74 style,the bumpers in some of these kits came with the 73-74 rear bumper,and taillight panel,And some did not,They had the 72 rear bumper,I even had one of those kits the was molded in off white and had an orange rear spoiler!,I had over 10 of these kits at one time over the years,and they varied in colors and parts,To bad this mold is gone forever!