I'm about to replace the flex disc on the 1984 300DT. I have new Lemforder flex disc; on one side there is writing as follows:

Made in Germany
SBR
SGF
GN 128
7

the opposite side of the flex disc is blank.

the other flex disc reads the same except instead of the number "7", it has a "6".

Question: which way does the Lemforder flex disc face? Also, where in the drive train does the #7 go? Also, where in the drive train does the #6 go? or does it matter?