Need parts id

Thanks for posting. It appears the top fitting has 'wings', or side tabs, while the bottom fitting does not. If so, this is a Series 395 Channel Balance. For the balances stamped 34-3, they should have 35" long metal channels (not including the end fittings). See the S395-35--for a stamp option, choose 3430. For the 28-4 stamped balances, the metal channel should be 29" long. See the S395-29. Choose 2840 as a stamp option. Let me know if you have further questions.