Finally, it looks like someone may be making them. I messaged him and told him how to tell the difference, don't buy until he confirms the model.

http://www.ebay.com/itm/Remington-Double-barrel-Vintage-Reproduction-Buttplate-5-1-4-L-X-1-9-16-W-/302113177729?hash=item4657594081:g:6ioAAOSwCGVX4LBb


I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.