Thanks!
The pipes are: STRAIGHTSHOTS: Performance Exhaust Systems
and not only the slip-ons.
The slip-ons will be an alternative if I cannot manage to get the footbard installed, but to install the slip-ons I need to re-install the stock pipes and them buy the straightshot slip-ons... and trash the straightshots
I was assured that the pipes were compatible with the footbaords at my HD dealer, not truth after all.