I've been looking at 52 tooth sprockets for my 2005 WR450 and most online OEM parts places have the '04 (which is around $20) but I've found one or two that list the '05 but that is over $50. Yamaha Motor site is not working right now so I couldn't check to see the '04 and '05 are interchangeable. Does anyone know if the '04 is the same as the '05 as far as bolt-on? Over $50 as opposed to $20 is a big difference. Thanks.