Anybody need a backhoe front?

Just found this from the government surplus. I'm quite surprised that anything of this era is still in the inventory. Any idea what it fits?

http://www.govliquidation.com/auction/view?auctionId=3295735

I believe that this backhoe attachment fits a Bycrus Erie 12 1/2ton crawler crane that was in the US ARMY inventory for a long time. I don't know what the actual crane model was as I was not a crane operator when I was in a unit that had these in them. They also came with a latice boom, wrecking ball, clamshell bucket, dragline bucket and a stripping type bucket with bottom dump in addition to the backhoe type bucket assembly being auctioned in this link. The US ARMY wanted to be able to perform the tasks that all of these different items were ment for. They also had a pile driver but I am not sure which crane it was ment to go with, maybe the 25 ton P & H that they also had. W. SMITH