The only thing I could find in the RWB supplemental was - "Stops to steering must limit riders hands from touching the fairing or tank at full right or left
turns. A hydraulic dampener cannot act as a fork stop." I saw no mention of a damper being "required", but in the AMA supplemental - page 22 -2.n states Steering Damper Required in all classes.
So the next question would be - Is RWB considered a class ?
Personally, if it isn't a physical engineering marvel to install one , I 'd say put one on. Better to have a steering damper if you need it at speed, then not having it.
Have you e-mailed or called the BUB office? Linea & Delvene are super nice to talk to, and if they can't answer the question I'm sure they will get you somebody who can.
Keep it fun, and see you on the salt.
Jimbo