Until 1980 a support bracket was fitted beneath the battery tray which transferred the weight of the battery from the upper part of the bulkhead to the lower part. Cars without the bracket sometimes developed cracks in the bulkhead, either side of the battery, probably because in the absence of the bracket the weight of the battery put undue stress on the thin metal.

A picture of the bracket is shown below. It was fitted below the battery with four M5 screws (8mm heads) going into captive nuts. Some cars produced after the bracket was discontinued nevertheless had these fitting screws. It was therefore a simple matter to fit a bracket retrospectively. However, if your car doesn't have the fixing screws you can always drill suitable holes but you will need an assistant to hold the nuts inside the car while you tighten the screws.

The brackets are still available from the usual suppliers and itís a good idea to fit one, as even if cracks have already started the bracket should stop them getting worse. Approximate dimensions of the original support bracket are shown in the photo. If cost is a factor it should be quite feasible to make your own from a sheet of steel after making a cardboard template. The 'cut out' shown in the photo fits round the lip between the upper and lower bulkhead. A piece of felt or rubber should be placed on top of the bracket, between the bracket and the underneath of the battery tray.

There are also British made brackets of a different design which incorporate a holder for the voltage regulator. These are fitted using the screws which hold the battery tray in place and are therefore easier to fit. They transfer the weight of the battery from the upper bulkhead to the lip between the upper and lower bulkhead panels.
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