I have the high and low horns (stamped with H and L) that came off a '72 FJ40. I tried a quick test with a battery but couldn't get sound out of either one. Coolerman has great restore how-to here. If you want to roll the dice and cover the cost of a medium flat rate box, then Merry Xmas they're yours for $15.05! If I'm reading SOR correctly these are original to 10/69-9/75.