These are vwer nice resin castings . Tis style of side nuber boards were used on the Missouri Pacific  and Southenr pacific, for the Baldwin AS 15  thru AS 616  models. when the were retired these featres remaind . You get 4 pcs.  Models will have to be modifed to add them.  Size .520 w x .180  h x .180 d
 
Note select Standard shipping  -- $12.50  at ------- Check out