I just made mine to fit.
As far as I know, sideboards were never offered as an option, and probably weren't even made after market, except by the owner. Which opens up a world of possibility for you -- you can make whatever you like and it's no less correct (as long as your hardware is correct for the period) than anyone else's.
Lots of guys have made their own -- cruise through the Gallery (use the menu bar above) and see if any in there fit your liking or give you ideas.
And welcome to the Stovebolt Page, by the way!
Regards,
John
