The Poly bushings just slip in. First time I saw the hex sleeve. don't know why it's necessary. Polygraphite won't squeak, not that the regular poly does, but some people complain about them.
Hard part is getting the old rubber ones out. lube 'em up before you close 'em up. They should be pleasantly firm.
FYI, the factory race cars used bronze bushings. Dude. If you squish these out, that's what you will need to do, or possibly Delrin. Lay off of the testosterone pills.
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