Questa e' la risposta che mi e' appena arrivata da Zip, quindi e' impossibile stabilire la misura senza misurare (ma come l'hanno progettata sta corvette? come fanno a non aver traccia delle misure giuste corrispondenti a un modello preciso??):


after discussing this issue with my parts manager, he says you are going to have to measure the sway bars, sir.
We cannot just send a particular size bushing, since there were many different sized sway bars that went into the
Corvette! We carry 19 / 22/ 24/ 30 milimeter size busings. Get the proper diameter (or circumferance) of your front
and rear sway bars off of your 1984 Z-51 suspension, and let me know. That's the best I can offer you at this time