well thats buisness for you why sell good cheap shit when you can sell shit expensive shit!!!!!!
i had a similar prob with my 97 suzuki rmx 50 and the crank shaft paid 250 euros (200 pounds) for a new original suzuki part which was warped then after that bought a no name 1 for 160 euros ( 130 pounds) which was fine.
sorry about the photos still havnt been to my old mans place to see the bike yet, sorry mate will try to get over there asap.
take it easy
Steve