I've got a stock 03 yz125 that I need to go up on the spring rate in the rear. The 03 yz250f is a 4.7, and the 03 yz250 is a 4.9. Either of these rates will work fine, and I assume the 03 model springs would swap out. Does anyone know the other years of oem yz250f and yz250 springs that would work on the 03 yz125? I'm asking about oem springs because I am assuming I should be able to find a take off cheap somewhere as opposed to buying a new aftermarket spring. Thanks!