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
ß 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.