upgrade.json

{
    "forge_marker": 1,
    "defaults": {
        "model": "extragenarators:item/generated"
    },
    "variants": {
        "variant": {
            "speedboost1": {
                "textures": {
                    "layer0": "extragenarators:items/speedboost1"
                }
            },
            "speedboost2": {
                "textures": {
                    "layer0": "extragenarators:items/speedboost2"
                }
            },
            "speedboost3": {
                "textures": {
                    "layer0": "extragenarators:items/speedboost3"
                }
            },
            "speedboost4": {
                "textures": {
                    "layer0": "extragenarators:items/speedboost4"
                }
            },
            "powerstore1": {
                "textures": {
                    "layer0": "extragenarators:items/powerstore1"
                }
            },
            "powerstore2": {
                "textures": {
                    "layer0": "extragenarators:items/powerstore2"
                }
            },
            "powerstore3": {
                "textures": {
                    "layer0": "extragenarators:items/powerstore3"
                }
            },
            "powerstore4": {
                "textures": {
                    "layer0": "extragenarators:items/powerstore4"
                }
            },
            "multiplier1": {
                "textures": {
                    "layer0": "extragenarators:items/multiplier1"
                }
            },
            "multiplier2": {
                "textures": {
                    "layer0": "extragenarators:items/multiplier2"
                }
            },
            "multiplier3": {
                "textures": {
                    "layer0": "extragenarators:items/multiplier3"
                }
            },
            "multiplier4": {
                "textures": {
                    "layer0": "extragenarators:items/multiplier4"
                }
            }
        }
    }
}