A few guys have obtained "blanks" from Grizzly and left beveled them. That was before the current rage and I've not heard of anyone getting blanks recently. Using a blank would still be better than trying to convert a right beveled Grizzly head but it still yields less than perfect results due to the way the laminations lay on the Grizzly, they'd be better off reversed for a left beveled head.
Tusker can get you "blanks" and Zwickey and Eclipse have left beveled heads available. Your only option for Grizzly blanks is straight from Grizzly, and well...good luck.
