The 'fat ends' should be up. On OEM shocks, water was thrown up on the rods while driving. It ran down under the loose-fitting gaiters. Under the gaiter is a raised ledge that caught & held about a teaspoon of water until it rusted the shock top. For aftermarket shocks, I'm told that they work better if run with the fat end up due to the internal design. It also keeps oil against the shock seal rather than high-pressure gas, so the seal stays moist & holds pressure longer. Some cars can swap the shocks upside-down in a heartbeat and others need the mounts on the inner fender trimmed a little for shock body clearance.
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