Not sure if this helps, but the PA state definitions do not state a specific number of digits for a VIN
Section 102 - Title 75 - VEHICLES
§ 102. Definitions.
Subject to additional definitions contained in subsequent provisions of this
title which are applicable to specific provisions of this
title, the following words and phrases when used in this
title shall have, unless the context clearly indicates otherwise, the meanings given to them in this section:
"Number." When used in the context of identification means a series of numerals or letters or both, with or without a prefix or suffix.
"Vehicle identification number" or "VIN." A combination of numerals or letters or both which the manufacturer assigns to a vehicle for identification purposes, or, in the absence of a manufacturer-assigned number, which the department assigns to a vehicle for identification purposes.