They are Kuryakyn (8837) 2" Offsets for Passenger Board Mounting. Amazon sells them $44.99 with free shipping (LINK) Google them and shop around, you may find cheaper prices.
I don't have a problem with interference, the floorboards are NOT farther back, they're farther forward. If you compare the 2 sets of photos I posted you'll see the 2nd set shows the floorboards lower and more forward toward the foot brake. They are mounted to the bike with the 2nd hole from the front of the boards, NOT the first hole like most riders.Just out of curiosity, randy, but do these interfere with you getting off the bike or putting your feet Dow at stops? I noticed when I put my boards on I had to make a conscious effort to get my feet from hitting them. If they're a bit lower and farther back I'd expect a bit more interference.