I just put the cast iron 2388 rail on a 1680 this summer. We were in a hurry and just did the left side to get us by. It comes with the needle bearings and seals already installed. We put new shafts in also just to be sure everything was perfect. Both sides are identical and interchangeable. The rail is PN 352013A1 and the pin is 1979251C1. You will need to supply the bolts. To do both sides you need Qty 10 1_2"X1-3_4", Qty 4 1_2"X2", and Qty 2 1_2"X2-1_2" according to the parts guy. We used some other sizes we had on hand. I think it's safe to say that these rails are so much stronger that they will never break, short of all out abuse. You need to pull the sieves to get all the bolts installed. Have fun, Mike