The unit was an Elitedesk 800 G3

Download the driver bundle from here : http://ftp.hp.com/pub/caps-softpaq/cmit/HP_Driverpack_Matrix_x64.html

Extract the Drivers then Import them into Out of Box Drivers on your MDT Share

Once done Update Deployment Share

Once done , replace image on the Microsoft Deployment Services

WIM’s will be installed to 

C:\DeploymentShare\Boot