FTFY:
Yo I got aps for my polar 155s bears and it makes it so much better-ive used both and prefer aps but both are good-but there is a problem. Bear trucks suck. The bushing seat is .95 by 2.5 centimeters wide and because of this you need to take a drill press and some 80 grit sand paper and sand them down to .95 to make them fit. Take a 3/8 bolt and bolt the bushings on and sand away making sure to have the paper perpendicular to the bushing so it doesn't taper. If you have a drill press use that, if you dont use a drill, if you dont just sand with hands and be very careful. Also remember that polar bears use .6 inch normal longboard bushings bs and .4 inch short series bushings rs. Also it's a lot easier to sand when it's barrel/barrel compared to cone/barrel and I prefer barrel/barrel by a lot because of how it turns then also so yeah okay okay okay okay.