Front Bumper Question

I have a 1991 JDM Integra, I was wondering how can I tell which bumper I have, because I have removed it several times to get my mesh sitting correctly, and I have never seen the bumper insert. I was wanting to put on the Wings West Big Mouth kit, and it says you need the insert. My bumper has the indicators in the bumpers like the later model ones. Can anyone help, I will post pics if that helps.

bumper insert as in the styrafoam ? it shoud be inbetween the bumper and the bumper support