I used the existing turnbuckle eyelet ends that came with the pump. However, I ordered the center section from
www.midwestcontrol.com It is a 9" long aluminum hex bar with the correct tapping 3/8-24 (PN AHT6-9.00) Here is the upper end of the turnbuckle on the backside of the alternator bracket:
That center section was a $5 part with $15 dollars shipping, haha. But when it is all said and done, I think my accessory drive system looks pretty awesome (note the turnbuckle behind the pump and alternator):
A better view of the setup, although the pic was taken before I installed the pump turnbuckle:
Hope that gives you some insight into another drive solution for a short water pump setup!
Next update will either be brake system plumbing of my C5 kit, or installation of the ATS670 steering box that I just ordered from Prodigy Customs / GP Superstore.