Stressed myke

Hi all, I'm trying to locate a clutch basket for what I believe to be a 1974 DT 175 trail. I'm restoring this bike and on stripping the engine down I found the basket seriously damaged. I know I can get a complete unit from the States as a last resort. But are there any other years that will fit?? If they need machining etc that will be fine as my sons are engineers and welder fabricators. Hope someone can help. Myke.