Black Mustang Boss 302 *unfinished, need help*

[oscargarza88]

hey,
this is my first real scale car... its a mustang boss 302, i think the brand is hot rod or something like that.
and i have a problem... in the last pic i will explain:
this is the car and the parts:

here is the prob:

i cant stick that into that and make it stay...

the glue is not strong enough,andthe gap is too big cause it doesnt fit perfect...


this is what i have, i hope this is the right stuff...

thanks, ive had this for almost a month i havent had time to figure it out, help me i know this is something easy... ops: