corner key in the correct size

The bottom horizontal rail of the window/screen has a larger channel for the corner key than the vertical side rail. I tried part 95.016 which is 3/16" on both legs. It went easily into the bottom rail, but I could not get it into the vertical side rail. The vertical side rail opening looks to me like there would be enough room for a 5/32". Part no. 95-015 is a window tilt corner with one leg 3/16" and the other leg 5/32"...it looks like it might work, but I can't find a bottom corner key in that size.