Thanks for posting. Yes, it looks like the bottom nylon fitting, or what we call the shoe, broke, hence that extra fragment in picture '9'. This is either an S351-29 or S390-29 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare these options with an undamaged balance, either the other from this window or from an identical window in the house, to see which replacement matches best. In either case, for a stamp option choose 2830.
Hello!
I apologize for the typo. Yes, you would need a 2820 stamp like your originals. This stamp option can support a 12 to 16 lb. sash. If there is any hesitance, we recommend weighing the sash to confirm this range.
Please let me know if you have any additional questions.
No problem!
