I recently picked up a '74 250 cross from a neighbors estate sale. The bike is in absolute mint condition. After looking at other similar bikes I noticed my swingarm and brake linkage are different. They appear to be have been cut and extended as there are welds in both the linkage and swingarm. Everything looks very clean and I am wondering did some come this way from the factory or was this a popular mod back in the day? Thanks for your help.