Final answer:
According to OSHA rim matching guidelines, the matching side ring for a rim-based stamped B7520 FL is the one with the same specifications and properties as the original side ring.
Step-by-step explanation:
According to the OSHA (Occupational Safety and Health Administration) rim matching guidelines, when referring to a rim-based stamped B7520 FL, the matching side ring is the one that has the same specifications and properties as the original side ring. The OSHA rim matching guidelines ensure that side rings used in tire mounting procedures are compatible and safe.