Interesting..........the '87 part# is 16065A, and the '88 part# is 16065. This ought to make them different parts indeed. However, the reed cage numbers are the same: 12021
So this tells me that the hole pattern is the same. I imagine that perhaps the length of the runner might be different, since the part numbers for the carbs are the same. If you look at the parts side by side, it appears that the runner itself is a bit longer and angled on the '88 model. They also show one of the "ears" that most intake boots have, that extend into the reed cage. If the length and angle of the '88 part isn't a problem, then those ears could be trimmed if need be. Then again, if the reed cages are the same, it's possible the '87 illustration just isn't very accurate and/or the ears happened to have been added in '88.
I am in the same boat as you though. My carb holder is also in pretty bad shape.