What sort of advise would you like? How to do the job? You should be ok with lowering it 40m as there is loads of arch space on the focus, if you aint sure how to do thejob get yourself a haynes manual, its a simple enough job to do, just unbolt and swap over really. Have a look in the pictures section of this forum, theres bound to be a few threads there on focus's that will show lowered ones. Hope that helps.