Not sure how the 400 grips look or fit, I would think they are the same on both models can't see why Suzuki would make different grips for these two bikes. The plastic sleeve does not have any rubber on it, at the end of the sleeve where it meat the switch housing there were two lips one held the rubber grips in place from sliding off and the other was at the end of the sleeve that was almost against the housing, I had to remove the lip that help the stock rubber grips in place as the vista would not fit over it but did not remove the end lip as that keeps the vista from hitting (rubbing) against the switch housing or sliding off also there is a clear plastic ring that comes with the vista that you would put between the vista and the new grips that will make it not rub when you turn them. Hope this helps you.
I'm not sure I understand exactly because there are also two lips on the original grip, the rubber flange seems to kinda go over both of them.
I first removed the one closest to the switch housing, but there was still not quite enough room for the Vista Cruise so I took the other flange off also.
Now of course there is "maybe to much "plenty of room. I had to cut the rubber flange part off because it was "pushing" againist the Vista Cruise and would not let the
throttle return to it original position. Thank you very much for your help on this.
Your's with the new grip with rubber flange in place looks great. Did your "new" grip look the same as the original as far as the location of the lips ect.? Thanks again