Urethane bushings come with Yellow Zinc galvanized U-Straps. Yellow Zinc looks similar to the old Cadmium bolt and hardware coatings GM used at least till the 80's and probably into the 90's. Much better than the old clapped out rubber bushings or even new rubber bushings. They change the character of the sway bar operation enough that you may not miss the slightly larger piece.
This is a set of Red 1.125" (1-1/8") Greaseable Urethane Bushings.
http://www.summitracing.com/parts/ens-3-5176r/overview/
Pick your sway bar diameter and get a set... They are available in Black if you aren't looking to draw attention to them.
http://www.energysuspensionparts.com/search.asp
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
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And please let us know if and how your repairs were successful.