Wanted to buy 69 swinger 340 fan pulley

Jay B said
I also have 69 Dart Sw3inger 340. Is it supposed to have aluminum or cast iron water pump?
And are water pump pulleys specific for water pump?

69 and backhad the cast pump and a shorter dish on it. 70 up has the aluminum pump with the deeper dish. About 3/4 inch difference. Kim