Can't find replacement 2001 Silverado spark plugs

[markp]

Was going to replace the spark plugs today in my 2001 Silverado 1500 with a 4.8L. The plugs that came out of it are NGK PZTR5A and also say ACDelco 12567759. I've been to 4 stores (NAPA, Advanced, OReilly's, Sturdevants) and they all look at it like it's a ghost and have never seen it before. I can't believe with all the Silverados on the road they have not seen this plug and don't stock them. Where can I get these plugs or is there a matching replacement? Thanks.

markp
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[2000CAYukon]

AC Delco switched to Iridium (from Platinum). You want AC Delco 41985 plugs for your truck.

//2000CAYukon

[wafrederick]

Sometimes some spark plugs are discontinued and go up to the upgraded plugs.CarQuest did this on one AC Delco spark plug number already.

[mwid73]

Yeah, Yukon is right. The plugs you want are AC 41-985. Same plug that I just put in my '02 6.0L. I got mine at O'reilly's, the ACDelco 12567759 means nothing, it's just the GM part#. They are spendy but you'll only need to change 'em every 80,000 - 100,000 miles.

Make sure you set the gap ( 0.060 ) mine were only gapped at 0.042 in the package.

[ukrkoz]

so you have AC DELCO plugs made by NGK? or the other way around?

anyhow, I really don't know, and don't quite care how much iridium tipped ones are from one of those manufacturers. I use exclusively HALO plugs, for improved mpg, slight power improvement, and overall quality. also, I do not miss setting gaps, as they do not have any.

and no, I have no $$ interest in the product. just been using them for yrs on most of my vehicles.