Hey guys
The pad top and bottom are Dura-Alunimum from building supply stores.  I just happend to see the groves alun and thought that it may add to the pads...  It comes in 8 foot lengths.
Joe:  I am starting on new undercarrages for hyd log loader.  Still have to figure out how to build a CAT 527 skidder and be able to fit everything into it !
Here is the process I used to make the pads.