Having just been looking into this, I can confirm that the part numbers for B18c4 LMAs from lings are the same as the newer ones advertised on tegiwa etc... 14820-PCB-305.
Seems that the teg GSR got them from around 1995/96, so puts it in the same period as our vti
Tonight I Put some flash band on the outerdoor skin, filled the doors with waxoyl and replaced the plastic inner bag with flash band aswell. Best thing I did on my eg stopped all the annoying rattles. Music was louder and cleaner.