There are good deals on eBay, if you look... the '72 should have a 3656199 ballast resistor. These were just for a few years before the 3874767 replaced it. If you want a real 1972 part it will cost you around $40. The more common 3874767 ranged from $9.99 to some yahoo that thought it was worth $225..... I bought the $9.99 one....