ploof-pack/faithless/assets/minecraft/models/block/orientable_stairs_face.json

{
	"parent": "block/block",
	"textures": {
		"particle": "#side"
	},
	"elements": [
		{
			"from": [0, 0, 0],
			"to": [16, 0, 16],
			"faces": {
				"down": {"uv": [0, 0, 16, 16], "texture": "#side", "cullface": "down"}
			}
		}
	]
}