Question about /unlimited command perms with Group Manager

So I was trying to add it to vip perms, I went through added all the perms with the following:

essentials.unlimited.item-[itemid]

So I gave them the specific Items I wanted the certain ranks to have using the above command, however they had no permission to use the command without the perm line of:
essentials.unlimited

So that they could use the /unlimited command

Bad news is, when I do that it seems that they can use /unlimited to spawn in anything, and that wasn't what I was looking for.

Just looking for help to figure out how I can make it so that they specifically can only use certain blocks and not all of them because so far I am stumped beyond belief.