upgrade.json

{
    "forge_marker": 1,
    "defaults": {
        "model": "minecraft:item/generated"
    },
    "variants": {
        "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"
                }
            }
        ]
    }
}