Sump guards can be fairly easily made - we put them on Golfs and old Benz 123 saloons to make them a bit more "bush proof", protecting sump and rad. Often there are plastic type guards that can me roughly copied IIRC. I have no idea what sort of suspension a BMW has, but on the Golfs we also jack them up a bit by adding spring spacers made from conveyor belting cut to fit. Works well. I was impressed by the conveyor belt spacers so stuck them on my TLC 105 and no complaints at all. Probably be a difficult one to source, but we also stick Ukrainian tyres (Rossava) on these 2wds with a taller profile and they also add a bit more durability compared to most road orientated tyres from the more "normal" manufacturers. IMHO the good old Benz 123 is still one of the kings of the busch, and are much sought after for their unburstable strength and basic mechanicals.
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