Looking at a couple of 3 T measured the rails #1 has a rail hight of 4 1/8 in. and 8 1/8 in. from center of pin to center of pin # 2 is 4 1/4 high and 8 1/8 on the pins Any one have a wear chart or info on these ? The link # on # 2 is Sealed Link 1S1864 if there is info post hear some help finding it would be good Thanks for your time MTMike