No, both the 25956915 & 25956916 show as being available on many online GM parts sites.

I did find a ton of info on the LS/LT outer tie rod end on the Dorman Products site:

Product Specifications

Adjustable: Yes Adjusting Sleeve Included: No Ball Joint Included: Yes Bearing Material: Polymer Bolts Included: No Boot Color: Black Brand: Dorman - OE Solutions Castle Nut Included: No Center Mount Hole Quantity: 1 Center Mount Stud Quantity: 1 Color: Black Cone Outside Diameter: 12.3 mm Cotter Pin Included: No Dust Boot Included: Yes Dust Boot Material: Polychloroprene End 1 Attachment Type: Threaded End 1 Gender: Female End 1 Thread Diameter: 14 mm End 1 Thread Direction: Counterclockwise (Left) End 1 Thread Pitch: 1.5 mm End 2 Attachment Type: Threaded End 2 Gender: Male End 2 Thread Diameter: 12 mm End 2 Thread Direction: Clockwise (Right) End 2 Thread Pitch: 1.75 mm End 2 Threads Per Inch: 2 mm End 2 Type: Threaded Finish: E-Coated Grade: Regular Grade Type: Standard Grease Fitting Included: No Greaseable: No Head Drive Type: Hex Height: 92.4 mm Housing Material: Steel Length: 110 mm Locking Nut Included: Yes Material: Steel Mounting Hardware Included: Yes Outside Diameter: 36.57 mm Package Contents: 1 Tie Rod End; 1 Nut Package Quantity: 1 Packaging Type: Box Pre-Greased: Yes Selling Package Quantity UOM: Piece Shank Length: 12.3 mm Stud Length: 35.5 mm Stud Type: Threaded Thread Pitch: 1.75 mm Tie Rod End Thread Diameter: 14 mm Tie Rod Material: Steel Tube Diameter: 19.55 mm Type: Straight Washer Included: No Weight: 3 lb Width: 36.57 mm

The above info is easier to read on there website under specifications:
https://www.dormanproducts.com/p-150...End&origin=YMM

 

So this is why GM did this:
Chevy engineers point to the revised roll-center height, new steering knuckles, and different antiroll-bar mounting points, which they claim help exorcise the front-wheel-drive demons. When pulling out of slow, tight corners, torque steer never raised its squirmy head on dry pavement. We also took a turn in the 235-hp car in the rain, during which we did feel tugging at the wheel, but the car didn't dart off in all directions. In all, it was a commendable performance.

Steering wheel: HHR SS has a smaller-diameter steering wheel that complements a quicker-acting, more precise steering system.
Steering ratio: 14.8:1 (variable)

The LS / LT steering ratio = 18.5:1

 

Just don't assume the parts peddlers listings for SS are correct. But you already knew that.

I thought ZZP had some. Should be the same as 2008-2010 Cobalt SS.

 

So anybody want to measure their SS tie rod ? It’s easy enough to look at online information but we know that can bite you in the butt! One member here had issues with his intermediate steering shaft, seems the online Mumbo jumbo was incorrect. So I try to get confirmation from members here. As the last SS rolled off the line about 15 years ago we can’t trust suppliers info on internet sites.

 

not sure the Saab units look offset and are listed left and right part numbers
https://www.rockauto.com/en/catalog/...e+rod+end,7428