Silvers I have always called the lower pad the trestle type with its X type construction. I beleive it got its nickname because its looks similar to the "Howe Truss" railroad bridge that became known as a "Trestle Bridge".
Mike Covington I have a 1912 vintage sterlingworth that had a Silvers pad that was crushed and hard when I got it in the 70's I believe it was original to the gun. the Hawkins and Jostam pads are post 1917 pads. I think the Silvers would be the right choice although any pre WWII pad would look nice. Paul