98 z28 AC belt tensioner/idler question

All,
There are TWO identical pulleys used for the idler and tensioner for the INNER serpentine belt ( AC ), and both have flat smooth surfaces.
When I tried to buy replacments for these, the parts people tell me
they aren't listed, and try to give me the OUTER ( much wider ) tensioner and idler pulleys.
1) What gives here? Is the wider pulley( smooth ) meant to be a replacment for the narrower one? It seems to me like this not correct.
Is this a dealer only item?
Any thoughts on this?
thanks, mike s 08/07/04
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Get the part #s from the GM dealer and then give THOSE to the aftermarket folks and have them cross over the OEM # to the Gates, Dayco or other brand part #.
Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going.... '91 S10 Blazer 4.3Z
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