12.1: Actions detrimental to stock car racing.
20.4.b: Body; All approved OEM-manufactured body components must be used as supplied except as required to stiffen, or to attach to other vehicle components. Tolerances from CAD surfaces and template tolerances are provided to allow for manufacturing, fabrication, and installation variability. Approved Parts: GM R: NSCS 0786. Part Name: Quarter Panel RS, Effective date Aug. 1, 2012.
20.4.2: Surface Conformance (a). Coordinate measuring machines, scanning equipment, and templates, among other tools, will be used to inspect body surfaces for conformance to the approved OEM and NASCAR CAD files.
As a result of this violation, crew chief Matt McCall has been placed on NASCAR probation through Dec. 31.

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Additionally, two teams – the No. 48 and No. 51 – have been assessed P1 level penalties for receiving written warnings in two consecutive events, both at Charlotte Motor Speedway. The No. 48 team received a warning from the May 16 event and also received one from pre-qualifying inspection from last week’s event. In addition to receiving a warning from the May 16 event, the No. 51 team also received one from pre-race inspection from last week’s event.

Per Section 12.5.3.1 of the NASCAR rule book:
Warnings and P1 penalty options: b. Multiple warnings issued to the same member or team will result in one or more P1 penalties; c. If the same team receives two warnings during the same event or two warnings during two consecutive events, whether the events are championship or non-championship, then this may result in one or more … P1 penalties at NASCAR’s discretion.
As a result of these infractions the No. 48 and No. 51 teams will receive the last two choices in the pit selection process, respective to qualifying results, for this weekend’s event at Dover International Speedway

-- Release courtesy of NASCAR