I don't know what you guys are talkin' about, but just in case this helps you with a custom solution... I had www.spidertrax.com machine some sleeves to press-fit onto rear lower control link rubber bushings. They sell it as a product now, including the bushings. Link here and here. They're most likely a different size bushing than whatever you have, but it might be a possibility. These are hard rubber but still might be too soft for use in the front since they're rubber and intended to flex some. I'm not sure.

Jeff
2000 4Runner SR5, supercharger, rear e-locker, ARB front locker, 285/75R16 MT/R's, custom bumpers & skids
2007 Tacoma double cab 4x4 - stock