If no one chimes in with one, you might try a motorcycle salvage yard where they are hooked up with a computer to multiple salvage yards around the country (and search the data base by part number).
The part number for: COVER, R. SIDE *R223P* (PEARL SEDONA RED) is 83500-MZ0-000ZG. The part of the part number for a right side cover that is the color is last two letters - ZG for Sedona Red (which changes for each color available). So I think 83500-MZO is what you want for
any color (to be repainted).
I did this very thing for an Interstate (same as Tourer, except for the mount hardware) saddle bag lid.
The computer said it was "serviceable," but when I got it from a salvage yard, it was gouged up bad enough to need filler body work and then a repaint. I needed a black one (the most prevalent one made), and the gouged one was black, but it still had to be repainted.
https://www.revzilla.com/oem/honda/1998-honda-gl1500c-valkyrie/side-cover