I will qty 12 of these

Thanks for posting! Your balances appear to be assembled with a 19-018 Channel Balance Top, which is the one used on our Series 377 Channel Balance. These balances have a 15-005 Winged Channel Balance Shoe with a 1" depth; however, your existing shoe may be 7/8". 

That said, you'll need to confirm the depth of your shoe. If it is 7/8", please let me know as this will need to be a custom assembly.

Profile view of a winged balance attachment

You should also be aware that the recommended stamp for the replacements would likely be the 2910 option, given your 29 1 stamp. Although, to be sure that this is the right stamp, you'll want to be sure that your sash weight falls between 7 to 12lbs.

Please don't hesitate to reach out with any questions you might have.