Firestone Air Bags Question

Looking to install the airbags on my truck. Truck came with a one inch lift block in the rear. I understand that there is a bracket that is supposed to be right over the axle but if I have the one inch blocks, the bags won't have support from the axle? Can I put something in the gap between the axle and bracket, like an extension or pressure wood, etc?

I found a few threads from a couple years ago, this question was brought up but was left unanswered. Same with another thread I found.

If anyone with this set up or similar set up can give some advice. I do plan on adding the daystar craddles also.

 

They attach to the springs, the block doesn't matter.