This is a 1 piece adapter marked 0410. From the Offenhauser catalog. For 32-48 or 39-50 Mercury & truck transmissions thru 52. Chrysler “B” with ignition in front. 1958 1959 1960 1961. I reserve the right to be wrong. All information here has been taken from the 1981 Offenhause catalog.. This adapter puts a’39 Ford 3-speed box behind a “B” Chrysler Dodge Plymouth engine.