hifi engine

Norman Laboratories Speakers

I recently bought some Norman lab speakers at an estate sale. I bought model 11 there. This weekend I bought a pair of book shelf model 52 off EBay. They both sound great but both pairs need new surrounds. The 11's have 10" woofers and the 52's come with 6.5" woofers. Does anyone have information on the speakers and which specific surrounds to use. I am aware of the history of Norman Labratories and that it is no longer in business. Thanks