I compared my new CR31 to the CR29 I was running on my S90.
They both seem to be made in the same casting, so lucky for me, I won't have to go looking for another intake rubber that will fit, I can use the type I have and just order some extra.
Here are some pics of the carbs side by side:
(the 29 is the "dirty" one)
funny how they both have the tickler on the same side, but the cables on opposite sides, probably for some specific purpose.