Hes referring to the 1” spacer that the power wagons have above the factory bumpstop. I did not use the spacer when i installed mine. They work just fine. But i also dont have a spacer on the springs.
I would try it without the spacer and see.
Was searching the 'net and found a thread you started about the airbag install. Based on that I kept the bump stop spacer off and installed the cradles. Just normal empty driving the bags sit flush against the cradles. Haven't done much testing as I just got the cradles installed Saturday and was gone all day Sunday. Planning on seeing how much droop is required to cause a gap between the bags and cradles. My thoughts are if just in driving and hitting a pothole if the axle will droop enough to loose contact with the bags....and not even sure that is an issue or not....
To answer a previous post. These are the style with the internal bump stops. Reading about how the internal bumps are/may be lower than the factory stops (if I read it correctly) was part of the reason I left them off.
For people searching how to install the cradles, I drilled the lower bump stop pads and used thread forming (self tapping) 3/8" bolts. The other option is drilling and tapping, but decided to try these bolts versus buying the tap. Somebody said they were able to get a wrench on the underside for a regular nut and bolt. At least on my '16 PW the lower bump stop pad is completely boxed in and there is no way you get a nut or wrench in under it.
For the schrader valves, I installed them in the two existing holes in the sheetmetal trip that sits back in and below the tailgate opening. They work but not sure I like them there. Makes them kinda' hard to get to and you have to squeeze your fingers in to reach them.
Have about a 5-6 hour round trip towing this weekend to test them out.