Most use Cobra boards. I do at the driver position (with heel toe shifters), not the passenger (I never take a passenger)
However, if you look at Kuryakyn products, check out the ISO Wings, which is like half a floorboard. You have to get the specific mount piece to mount to the valk rear (or front) peg position, then the ISO WINGs (without ends) mount to that mount. This is better than pegs,
but only half to a third the cost of a set of Cobra Boards. You can do the same thing for driver's peg replacement (with or without a heel toe shifter)
Iso wings without ends. Go to their site to find the mounts for front and/or rear valk pegs.

At the driver position on Valk
