It is the other apps bushing (white one). Red, it says for W56, the blue it says for t-cases, so I mean there's only one left. It even says for toyota celicas and supras. Did you check the site? Just asking.
I'm picking my kit up at the next local meet so I haven't installed it yet. On the site....it says it just rotates into position with the machined notches. I don't think those were there before though I cant remember for sure. If so then it will probably just be a drop in app so to speak.
Search "BillyM shifter bushing kit" on this forums. Or some combination of those words. I think some of the vendors, last I asked, BillyM as well has them in stock. I'm getting the kit from a local vendor so I don't know who stocks it other than him, check around.