What's this called or the part number?

[2ndGlock]

 

[swathdiver]

GMPartsDirect and GMPartsGiant are your friends.

 

[2ndGlock]

GMPartsDirect and GMPartsGiant are your friends.

I've checked them out but this must be a very uncommon issue as I can't really find it/think may be it but not 100% sure from the (lack of) description and the photo. Oh wells, at least it's not on the driver's side...

 

[swathdiver]

I've checked them out but this must be a very uncommon issue as I can't really find it/think may be it but not 100% sure from the (lack of) description and the photo. Oh wells, at least it's not on the driver's side...

It's a trim piece that covers a 10mm bolt. 25897906 for Driver's Side in Ebony

That should get your nose on the scent.

 

[Doubeleive]

I've checked them out but this must be a very uncommon issue as I can't really find it/think may be it but not 100% sure from the (lack of) description and the photo. Oh wells, at least it's not on the driver's side...

just go to the dealer parts department with the last 8 of your vin, they can order it or give you the part number. like Swathdiver said it's just a trim cover.
based on his part number above you could also try searching that part number with the last number changed 0-9 as that is usually how gm will label parts based on the color and left/right
like this

07-09 TAHOE YUKON DRIVER SIDE FRONT REAR DOOR INSIDE HANDLE BOLT COVER 25897909 | eBay

This GM driver side front rear door inside handle bolt cover is a perfect fit for your 07-09 Tahoe or Yukon. The high-quality door handle is made to last and will provide you with a seamless opening experience. This item is a single piece and is designed to fit perfectly on the rear of your...

www.ebay.com