zenki to chuki bumper conversion

what do u need to make this work?
i have the bumper partially on, but, visually you can
see that there will be gaps and it does not sit flush.
its an 89 s13 hatch. does this have something to do with the fenders?
tricks or tips?
walkthroughs with pictures?

do you have the fender caps?

what are fender caps hahaha
sorry noob question

nvm i got it.

wait wait wait
still doesnt fit flush
fender caps?
any ideas?

Rebar?