This is as close as you can get, you select the 14 inch. remember, the 14 inch is to top of lid. Back when your RV was made, it was not uncommon to remove the existing toilet and install that wood riser because the original toilet was to LOW. So, it is possible to remove the toilet and if there is nothing under the existing wood base but the down pipe, you can install a shorten 3 inch down pipe and mount a toilet to the main floor. Doug
https://www.campingworld.com/aqua-magic-style-ii-high-profile-white-17-12-35653.html?gclid=EAIaIQobChMI14XRj8W86wIVEfDACh1HDQp4EAQYBCABEgKhrfD_BwE&gclsrc=aw.ds
