Eddie Meyer used to be available in 21 Stud. Since Don Orosco passed away I don't know who is doing them.Perhaps Doug Clem in Nevada.Here is info I found when Googling it.
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Differential Housing
// Eddie Meyer 21 Stud Cylinder Heads (1932 to 1936)
Designed for use on 1932 to 1936 Ford flathead V8 engines, these Eddie Meyer cylinder heads are the only heads currently manufactured in the US for the 21 stud Ford flathead V8 engine. Will also work on 1937 and 1938 Ford flathead V8 engines by moving the water pumps to the cylinder heads from the block, and using block-off plates to cover the exposed water pump holes in the 1937 and 1938 blocks. Please inquire for additional details. Compression ratio: 8.25 to 1. Available for either flat top or domed pistons.
CALL 831.649.0890 FOR MORE DETAILS & TO ORDER