Searching GM part nos. listed by Navy Lifer in a 2001 thread (GM P/N 18021162 and 18021163), they are shown as currently available at least from GMPartsGiant. But those same nos. don't show in RockAuto who generally keeps good stock.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, SLP SS, 3000 Edge, F/HO bars, METCO extendeds and CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: SS Bars, METCO LCAs, Koni Reds, PowerTrax No-Slip