Will this work?

A – try to buy local and not from source. B – the old gyro 3 isn’t a great setup, it’s decades old and takes time to setup right. Any u -brake kit will work generally, as long as your frame has gyro mounts and/or is drilled for removable mounts. If it’s a modern frame, you’ll need a gyro top plate as well, the one that usually comes with the ody g3 won’t fit modern frames.