Once you have removed the pillion footrests, fill the void left behind and cover those otherwise exposed holes in the sub-frame with the R&G blanking plates.
This Footrest Blanking Plate have been specially designed to cover/protect the left side of the KTM 990 Duke '24-
R&G Footrest Blanking Plate are easy to install, simply screwing into place in-place of the rear pillion pegs, covering those otherwise exposed sub-frame holes, that if left uncovered could result in corrosion of the frame/subframe from dirt, water and debris buildup.