Cluster of clusters

The instrument cluster that came in my '70 Duster (just realized today it is not a '71 like I have thought for the past 8 years......pays to look at the title now and then.... ooohh the shame). is different then the one's that I see. It looks like the one that is in the pic's that I saw posted by moparfreak77
http://rides.webshots.com/photo/2631309040058190457dcQkRn
it is kinda beat up so I have found another cluster but it has the round guages and looks like all of the duster clusters that I have seen. The original had rectangle-ish guages.
I would like to find one that came in the car but just don't see them in Dusters.
Anything special about this style of cluster? Where or how to locate one?Which years etc. to look for?
Any info on this would be of great help.
Sorry no pic's ATM