This is what I used for the RB-81IIs: http://www.amazon.com/gp/product/B002UV03MW/ref=oh_details_o02_s01_i02?ie=UTF8&psc=1. You have the option to screw them in to anchor them more, but it's not necessary. This is what I used for my RS-62IIs: http://www.amazon.com/gp/product/B00009W5X2/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1. It uses the 4 holes on the back of the 62, not sure about a 2 hole option. Looks like they aren't available on amazon any more, but maybe you can find them, or something similar with a search?