I relocated the front holes back 2 inches and down 1 inch. I think I could have gone 2 inches. The track I have is a Kimpex Sherpaw. I did not have time to drag the sled out of the storage unit to take additional pictures but will do so in the future.I am guessing the front mount at 2.5" is straight back correct? I would be interested to see some better pictures of your set up. I was under the impression the 141" track was 3.0 pitch . The 136" is a 2.52 pitch I thought drivers would have to be changed.