Single leaf car/Multi leaf housing

[68454RS]

I'm in a jam and might be having to move very soon. I have a 12 bolt that came out of a multi leaf car and I want to put it in my single leaf car to avoid having to pack/haul etc.. So, as you know, the depth of the spring perchs are about 1.5"-2" different (eyeballed, I have not measured yet)
Is there a "block" / "Spacer" that would suffice to do what I want until I get settled in to the new place?

68 Camaro