Help

Hi I need some I fo.i have a 05 Chevy Silverado z71 lt 5.3 I am in the middle of rebuilding it and now I'm at a point on the timing chain I know the 08 have dampener on them but when I took my 05 apart there was dampener there do the 05 5.3 not carry dampener ? The holes are there for 1 but no dampener I tried 1 out of a 08 5.3 but the holes are not spread apart far enough to bolt in the 05 if there is one that goes there can someone please help me

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  66jack