Problem pulling image from private repo using Kubeadm

Hi I am trying to install Kubernetes from a private repo of pre scanned images. The problem is Kubeadm is looking for specifically named containers. For example "kube-apiserver". The problem is the image name is "kube-apiserver-1-20". I dont have access to this private repo to change the name of the image. I am using a Kubeadm config file with the properties listed inside. Is there any way to modify this Kubeadm config file to look for the container I need? Thanks.

kubeadmConfig.yaml:

apiVersion: kubeadm.k8s.io/v1beta1kind: ClusterConfigurationapiServer:image: kube-apiserver-1.20 #wasnt sure if "image" could be used to change nameimageTag: "latest" #I have tried changing this around too.imageRepository: ironbank/opensource/kubernetes-1.20

Error: image ironbank/opensource/kubernetes-1.20/kube-apiserver:v1.20.6 not found, error: exit status 1

The image name is ironbank/opensource/kubernetes-1.20/kube-apiserver-1-20:v1.20.6