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To be honest if you want a full service just replace everything, as some parts arent that expensive
Gearbox oil
Fuel, air and pollen filter
plugs
Anything else that needs attention.
Gray recommended this place to me when I spoke to him about it before - http://www.vehicle-wiring-products.eu/VWP-onlinestore/cable/batterycable.php
Basically its a junction box from something like a E36 BMW, a race battery, cage and suitable wiring.