Before you spend money on "drag" bars you might want to settle on a seat first then focus on the bars.
You are right the OEM (Original Equipment Manufacturer) bars for the FXR2 and FXR3 are only 28 inches wide. I posted a THREAD in this Section regarding a transformation to different "wider" handlebars, easy to find THREAD.
Drag bars like every thing else is a "taste" thing.....you might check out FLANDERS through a google search and take a peek at their options for a drag bar that would fit an FXR in general, my budy PZN16 is an "official" "lurker" here never posts and fits the height requirement you mentioned above he is using some different bars than what was provided OEM as well but not "drag" bars.
You might take a "gander" to v-twinforum.com where there is also a FXR Specific Section and ask some FXR owners over thete as well.
Regards,
Tim