It is better to have an even number, which is convenient for adding pearls. Of course, in Buddhism, quantity is exquisite, but what you bring is just the right length, so there is no need to match it, that's all.

108 refers to the pure number of stars and months, not counting pearls or three-way Buddha heads.

Look at the size of your beads. The 8mm 108 necklace is a little long. It's better to split it in half, and add some matching beads, so it won't look short. The pendant should be bigger, which can improve the grade of the whole bead!