http://www.ebay.com/itm/261260032786?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1586.l2649
Have a pair of 13" 2.3mm Triple Flange Tom Hoops up on ebay. There perfectly round with only minor wear to them. Chrome is completely intact.
Don't know what make they are but they will fit any 13" Tom. Check them out.