I don't have the measurements in front of me, but you can find the replacement part for $13 on eBay. I need to order one soon to replace my dried out mess... I bet you could make due for a couple days by just wrapping strips of duct tape between and around the two open ends of the intake.
'94 SC400: Goodkat ... "It's not something people hear about. Falls on deaf ears mostly. This particular one has been over twenty years in the making."