My Model not showing up on the item its supposed to be in! [Solved]

[Crimed]

So i made a grenade for my server that i work for, and the item that i tried to place it with is kinda tricky because its the firework charge, for those who dont know, the firework charge has 2 layers, "fireworks_charge_overlay.png" & "fireworks_charge.png" but i want to make it into a model (.json) and its not working, the resource pack can be downloaded here (it is copyrighted so dont take any the assets from it and use it.)
Download Link:
http://files.enjin.com/1310328/ResourcePack.zip

[Crimed]

http://imgur.com/a/5fzNZ the model name is "assets/minecraft/models/item/fireworks_charge.json" and i want it to replace the "fireworks_charge.png" Item

[Sphax]

you'll need to rename your model file to right model file to replace a vanilla existing one or edit blockstate file to point to your model file if the model you want to replace is a block

[Crimed]

you'll need to rename your model file to right model file to replace a vanilla existing one or edit blockstate file to point to your model file if the model you want to replace is a block

Solved, thanks it was just a silly mistake because i did "fireworks_charge" when it was supposed to be "firework_charge"