I'm not sure about the first generations as far as the cradle width goes. I did that swap on a 90 and 91 and those are simple. Somehow I recall the cradles not allowing the 90 on swingarms, but not 100% on that.
Other than that, you will have to sleeve your pivot axle to work. The braced item uses a 25mm pivot, much large than the old ones. So you'll need new bearing races and a new crush washer that are the will fit your axle and allow then to ride in the large diameter bearings. You'll also need to snag the rear brake assembly as they do not use the setups to allow you to swap your old one on.
But I'm thinking it wont work in your app. You may need to find an old Meta whoosits swingarm.