If you google DIY floorboards, there's a guy that makes them out of aircraft aluminum. His are specifically for VN750s, but take a look at them, they may work on a 500. His bolt onto the foot pegs once you remove the rubber. I took a look and made some based on what he had, but I made mine more narrow/longer and out of 1/4" plate steele. He also shows a trick on making highway pegs that will work very well on Vulcans because of the two bolts on either side of the fram surrounding the radiator. Take a gander and see if they will work on your fiance's ride.