On how to install item #2, part number 5412012.. best sequence, method?
Yes the small end is turned inside out, that's the way I left it when I gave up for the day..LOL, that's not how it was when we were trying to install the new one.So is the tie rod end installed back in the knuckle already? I left mine disconnected until I got the boot on. It helped when I needed to wiggle the boot over the rack.
I just pushed the entire boot from the back until it compressed the accordion and kept pushing then kinda rotated the force applied in a circle as it went onto the rack.
In the pic it looks like your boot is partially turned inside out. That could be holding you back. Need to slide it back down the tie rod enough to pull it back up and flip it out again. There should be a flat part to put a clamp on.
I bought it in March of 2020 from the local Polaris dealer, it was a trade in.The plot thickens!
There is a video of someone "installing" rack boots on a Ranger (Polaris). He mentions that there is a L and R boot. He figures this out AFTER he installs the right boot on the left side. He went on to say he was not going to switch it and ordered another R boot. There was no putting a boot on the rack shown. Pretty much a video of a boot on a rack with someone saying in general "remove and replace".
This has nothing to do with the problem at hand, but another video that really isnt helpful but shows no indication of boot on the rack problems.
I believe there is likely something else causing the boot not to fit.
There are indications this machine was acquired by the OP from someone else.
I tend to agree with Wingman02 about the steering stop. And it should not interfere with boot install.
There seems to be information that the OP cannot provide about any repairs/upgrades to the machine prior to his ownership.
Another one of those "When simple jobs go bad" scenarios! It'll get figured out!