Help Poly LCA bushing install.

I have bushing PN ptp-4-205 prothane that I got from Summit.

Question - Does the bushing push in all the way to the large shoulder or just to the end of the old inner sleeve. My inner sleeve seems to be flared a smidgen at the end, where the small step in diameters is, I could just grind down the small flare and push the pin in until the head contacts the larger pin flange.
It looks to me like it makes sense that the head of the poly bushing should be flush to the larger step.
Any thoughts

Thanks
Dave