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Early C5's have two fuel lines (supply and return) as opposed to just a supply on later years. The slots are for the fuel lines.
Your fuel filter is cheaper than later years because later years have the fuel pressure regulator built into the filter. Your regulator is at the engine.
From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
If what you want is red fuel rail covers to fit your '98, you could either paint them yourself, or you could have one of the many vendors paint them for you. AutoBuffs can make a beautiful set in red for you, and the finish will be much nicer than the stock ones.....