Help me to identify the right balance

Your balance closely resembles both our S380-30 and S385-30. The only difference between these two balances is the depth measurement of the bottom balance shoe. The depth measurement of the bottom shoe is 1" and for the Series 385 is 1-3/32". Measure the depth of your bottom shoe, like in the diagram below, to determine which balance would make a better match. whichever one chosen will go with the 2950 option. 

Alternate view of 15-004

It is the stamp option that corresponds to your stamping of "29 5" which holds a sash weight of 28-32 pounds.