public Address getSpareDataAddress() throws InvalidDataTypeException {
		checkValidity();
		// component 1 is the spare data.
		Address spareAddress =
			EHDataTypeUtilities.getAddress(getDataType(), SPARE_ORDINAL, getMemBuffer());
		return (spareAddress != null && spareAddress.getOffset() != 0) ? spareAddress : null;
	}
Gets the address of the spare data or null if none is indicated.
@return the address of the spare data or null.
@throws InvalidDataTypeException if valid TypeDescriptor data can't be created at the
model's address.
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/TypeDescriptorModel.java