While going thru my templates I found the plastic template for this one your mentioned by Cheryl Phillips and I know I have the instructions for it too. Found a couple sizes of John Flynn's templates too as well as the mini set for Shar Jorgenson. Will be putting these out for sale in the next day or two as I've decided to go with Shar's templates for the regular size.
Thanks for letting me know where this mystery template came from.