make sure comparing apples to apples......AGCO has gone to a ca557 chain...the old one was a ca550 chain,,,,,the ca557 is much heaver.. just ask you agco dealer for ca550 conector and a ca557 connector and you will agree it is alot heaver chain......I don't think you can buy a ca550 assy from agco any more...all the part n's superced to the ca557...however you can buy just the ca 550 chain an put you slats on it, it comes ready to bolt on..... most of the after market people are selling ca550 chains and most are imports at that so you can see why they are so cheap......you'll have to decide if the ca557 is worth the extra$$$..I think they went to ca557 becasue all the custom harvesters wanted a chain that would last 100 years or something like that.....