These models are for bolting on ELS or QLS plates. The plate with the 3 drop holes has 2 threaded 10-32 holes and the bolts are included.
These are CNC machined and left unfinished to keep the cost down. The price is $27.50 for one hanger shipped First Class mail.
There is now a listing available with all color and style options and multiple item discounts apply. Here is the link to this auction: https://www.ebay.com/itm/333927364926