You might give these guys a call (no association). They sell all of the IOS modules.
2016-2018 Chevrolet Colorado MyLink® IO6 GPS Navigation Radio Upgrade
INTRODUCTION Our genuine brand new Chevrolet® navigation HMI modules feature a 90-day guarantee and a hassle-free return policy. Extended warranties are also available! Did you know Onstar® turn-by-turn navigation guidance costs up to $35 per month? Upgrade to factory Chevrolet® navigation today...