| CPC B60J 7/198 (2013.01) | 19 Claims |

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1. At least one shim for use with a tonneau cover assembly, the at least one shim comprising:
a first thickness;
a slot disposed through the first thickness and extending from an outer edge of the at least one shim;
wherein the at least one shim is configured to be selectively positionable adjacent at least one flange of a sidewall of a pickup truck cargo box;
wherein the at least one shim is configured to be engageable with a clamp that is engageable with a tonneau cover rail;
wherein the slot of the at least one shim is configured to receive a clamp fastener of the clamp; and
wherein the at least one shim is at least partially supportable by the clamp fastener when the clamp is in an unclamped condition.
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