the one with the 9/16 thread looks like its for 66/67 Chevelle not for 69 Camaro
I collect shifters and had a bunch of them over the last 30 years of buying them at swap meets. Some had the original chrome shifter balls,
they used to sell on ebay for $100 to $200 depending on the condition of the chrome
there was a repop non magnetic aluminum ball out at one time but not sure if they still sell them