Some of us still like to ride a board that is a bit on the narrower-side. And, of course, you need trucks to match it. If you step down in board size then it's time to step it up to the 130mm Polar Bears. Sold in pairs.
Bushings: 85a is softer, 90a is harder. Softer bushings are more lively but less stable - with 88a being what we usually use in our completes.