Finally got everything back together.
Here are the packers I used, which are 17mm ID and the same as the one that came with the shock.
https://performanceshock.com/index.p...oducts_id=1127
They are an 1/8" thick, so I started with adding three more to each side. I am guessing that leaves me with around 3/4 of suspension travel. Going to drive around like this for a few thousand miles. If there is no contact, I may remove one.