|Battery tray is modified using the brace from under the 65-66 tray and the top shelf part from a 67-70 tray. This will allow the wider radiator to fit and also allows use of the superior 67-70 battery clamping system. You can use the long studs on both sides of the battery or do as I did and use a bolt into the radiator core support for the front side. That is a simple flat peice of steel across the top. I used some thin rubber under the steel so it could not slide.
The Proxima battery with rounded corners is much easier to install. Square batteries require the radiator top clamp to be loosened and the radiator slid to the side a bit in order to get the battery in the tray. Hoses need not be disconnected.