1) am I right in my above assumption on the assembly?
I've never done the homework to determine the original factory configuration, but mine had bolts/nuts rather than clevis pins, and they appeared to be unmolested when I bought the truck. I attached a picture of one of my front shocks. There's a rubber bushing inside the end of the lever arm with a steel sleeve that the bolt goes thru.
2) Any chance someone knows or could measure the length of the rod? I'll have to fabricate one or both of these
I can go get the measurements for you later this morning. Do you need just the rear, or the front also?