Replying to Help finding decent sole inserts

Trying to get a decent pair of sole inserts for Dalbello Boss boots size 27.5 boot length 317. Im confused at what my current inserts that come with the boot mean. I have no idea what the Z and A length means in the pic bellow. In the end i'm just looking for some moderate sole inserts because I have some slide only on jumps and high jibs but still annoying. I plan on just slapping them in there and skiing, any help is appreciated.