Front Leaf Spring Caster Shim Install

[CJM72]

Hi All. Part way into install my 2.5" Tuff Country front leaf springs on my 72 K5, and I ran into a question related to the caster shims I have. As you can see in the pictures, the shims are slotted and slide over the center pin. The head of the pin barely clears the shim.

Should I install the longer bolt with the extra long nut with the nut facing down? The nut would have to be cut to length and it doesn't quite fit in the hole in the spring perch. I'd have to grind it to fit and then my alignment might be a little off.

Will the short little stub of the center pin be OK based on the picture? It's probably sticking out about an 1/8" or less. If everything is torqued properly, I can't see it popping out of the alignment hole.

If I slide the shim back so the thin section with the hole is over the pin, quite a bit of the sprint wont be touching the perch area. I don't love that option. I'd like to use these based on Hemi's comments about the approved tracking.