sprocket dimensions????

[trx750gsxr]

Does anybody know the bolt pattern for a stock 400 ex sprocket? Also the dimension for the hole in the center to clear around the sprocket hub??????? Check out my build here.......I'm going to machine my own sprockets.....just need these two dimensions.......thanks guys


http://www.exriders.com/vbb/showthread.php?s=&threadid=308131