The craigslist ad does not state their brand or part number. The Pacesetter number you posted is for headers with A.I.R. fittings. The headers in the picture has no fittings. Your '98 car will need headers with fittings.
The ad also states he bought them for his Silverado and that fit 2000-2006 Camaros. This guy doesn't know what he's talking about.
I'd also say these are ebay headers. I'd pass on these.
Last edited by Paul Bell; 07-25-2012 at 08:30 AM.