1970 2 Door B-Body ANCO or TRICO 15" or 16"

1970 2 Door B-Body. I would like to know what length is correct, 15" or 16". I have seen the ANCO's with the red release button and the TRICO's which are a little differnt. Were both brands used? Thanks

Not sure the brand but 2 door , not sure of convertible , uses 15" blades.