My '69 had lost all it's interior before I bought it and I'm guessing it originally had the de-luxe trim, anyway it has the the square pull type door handles.I've recently purchased a fairly complete interior which I'm sure is the more standard trim option with the lift up to open, more conventional looking handles. What do I need to change on the mechanism to make the replacement handles fit so I can fit the standard door cards? Many thanks in advance for any replies