i didnt need bushings to fit mine but i did need to file the edges of the blaster frames shock mounts because they were to narrow
i used kens bushings on the outside of the frame mounts, to reduce the bolt size for my sons 87trx 250 shock, some guys report removing some internal bushing from the shock pivot, for it to fit between the mounts, i say it's there for a reason....the bearing/bushing rides on it, if removed the bearing rides on your bolt ?????
i ground the shock bushings a bit
but is nice and plush with way longer travel than stock or 400ex, but did require a new mount on my sons +4 swinger