PE 00 020/ TREAD SEPARATION: LEFT REAR TIRE EXPERIENCED A TREAD SEPARATION WHILE TRAVELING AT 60 MPH, ONLY WITH DRIVER IN A 1983, OLDSMOBILE, 1998, AFTERMARKET EQUIPMENT, MILEAGE UNKNOWN, TIRE SIZE P215/75R15, DOT# HYHFT22355. FIRESTONE WAS NOT NOTIFIED AT THIS TIME. PROVIDE ANY FURTHER DETAILS ON THIS MATTER.*AK