F41 472118 bushings have 30mm (1.18") holes. The 472116 stabilizer bars (coded CY) are 32mm (about 1.25") in diameter. A difference of approx. 0.07". Which means the bushing will pinch the bar slightly when tightened to specs with weight on the ground. Which is exactly the part numbers you want. Note too, the larger bars take a larger "double hump" bushing bracket and smaller head bolts to clear the bracket. Brackets have the same space between the mounting holes, but the bracket part that holds the bushing is larger and the sides come close to the bolt holes. Thus, the smaller head bolts.
You don't want any gap between the bar and bushing. Just a little crush on the bushing, and that's where the 30mm around the 32mm bar comes into play. Once everything is tightened up, you won't have any slop, yet the rubber will still be able to flex a bit and allow the shaft to twist as needed (it really doesn't move that far at the axis points). The rubber bushings should keep things from bouncing around and clunking, but yet be flexible enough at the same time with minimal crush. Loose bars aren't effective.
Matching F41 bushing brackets for your setup above are GM p/n 14073310 (2 required) and the corresponding bolts are 15592554 (4 required). AND...to finish it all off, the end link kit is GM p/n 470147 superseded to 15991383 (2 required per car).