09 rear skid modification

my dad has a 09 dragon 800 121. last year we extended it to a 159, put the longest rail extentions on that we could then moved the whole skid back 7 or so in, I cant remember the exact num, and drop brackets. now my question is could we just put 159 rails on it and and put it back in the stock holes so that the geometry is back where its supsose to be? moving the skid back doesn't allow it to transfer correctly so were trying to do something diff but not really sure what will fit or work the correct way. any input or advice would awesome, thanks

drilling new holes isn't a big deal,but getting it in the correct spot is tricky, since the track is brand new he would like to stick with the 159, and you can find those skids pretty cheap from what iv found, would you happen t know the correct measurement from hole to hole?