I found the broadcast sheet for a 1969 Road Runner VIN: RM23H9G277?67. I believe the number in question is a 3. This is a B7 4-speed with B7 bucket interior. The vehicle order number is 253583. Car has air-grabber, AM radio, magnum 500s and the build date is 5/28. If this car is still out there, contact me with proof of ownership and it is yours.