I have a number of old developer CDs with system software images on them, but while they have 6.0.8, none have 6.0.8L. Was it shipped on floppy or some kind of download?
System 6.0.8L was a limited maintenance release of system software for markets in Apple Pacific. It was engineered to address some special needs for those markets that did not have access to System 7 at the time.
They made 6.0.8L primarily for the Macintosh Classic II and Macintosh PowerBook 100. I remember reading that it was because System 6 had a 8MB limitation, so they made 6.0.8L so it could address the Classic II's ability to hold 10MB. (Probably more reasons than just that.)