from memory, I don't think the green sleeves can be changed without stripping the trans but I cant remember. I straightened mine, well made it round again with a ball hammer, works fine. apart from it being very fiddly and annoying, I cant really give any pointers. just drop the gearbox oil obviously and make sure you have patience is about all I can suggest, took me about 2 hours to get the little clip back on the offside cup and never again am I doing that haha. good luck