33" x 33" windows

Thanks for reaching out! The bumper you are searching for appears to be part 15-148. Compare the dimensions to confirm that this is the exact bumper you need.

Dimensions for 15-148

This bumper is typically compatible with the 15-111 pivot shoe or the 15-191, which is the heave duty version of the same style shoe. Since there are (2) coils on each side of the window, you'd likely need the 15-150D Coil Double Support.

Alternate image for 15-111

These pieces are hardware are compatible with the Series 160 Coil Balance spring. To determine which coil springs you need, look for any stamps/markings that might help to confirm the spring strength needed for your each coil. You may also want to confirm that your coils springs are 1/2" thick.

If any of these pieces of hardware are not a match, I'll need to see the existing pivot shoe removed from the window.

Since the window is 16lbs you'll need the S160-7 coil balance springs. These coil springs are rated to carry 7.5lbs, which would be 15lbs in total, however, they will work fine in the window.

That would also mean that instead of the double coil support, you'd need the single coil support for the window. This would be part 15-150S.

Look over these parts and let me know if you have any questions.