Front Top Plate Spacer question....

Okay right now i have a 6" Pro comp lift and i have seen some people on here adding these for a little extra lift.

Would I have any problems running something like this? I've heard you can have problems with the control arms if the spacers are too big but i think those seem fairly small.

I don't know very much about coil spacers. I've read up a little about them but if someone could explain it better that would be helpful too. sorry for the noob questions haha

 

Shouldn't be a problem. Although I'm not very familiar with the 6" setups.