Hello,, the 1930 has one piece splash aprons and running boards. I believe the metal board is the same size, but the rubber is different between the two . On the 30 there is zinc trim on four edges, the 31 has small holes through the metal for bonding the mat to metal, and only has zinc trim on outside edge the other 3 have rubber trim. There are special bolts, some times called Chinese hats to hold boards to brackets , you may need to save the original ones. I usually get parts from Snyders, if all else fails they should know about the size. Good luck.