I´m not sure if they fit on an Argo but it seems that this tires fit on a KID 8x8.
http://route6x6.com/info/bro255.jpg
I also think these tires are to hard for a ride on an Argo. You should look for softer tires like the Runamuk to have a bit suspension at least, else you will jump around inside your Argo.