'97 and some '98 250s had the CB. Some '98s and '99s were blanked with plugs, the rest through '04 had the castings for the CB but would need machining to install it. Can be done though. '05 and up have new lighter castings that eliminated the CB area. The swingarm pivot and motor mount hole sizes changed in '03 as well. I have no idea what the quad used, but my guess would be the larger pivot on the '03+. On the bikes the cases and lower end are the same for 250/300.