1968 sport fury convertible speaker size

[440sportfury]

I wanted to know if the rear conv seat speaker is a 6x9 and also if the front dash speaker is also 6x9 I want to add the hidden speakers but am not sure of the size. I would appreciate any help with this Thank You

 

[Big_John]

Chances are it's a 4 x 10 in the front and a 6 x 9 in the rear.