3230 Channel Balance Identification

A contractor says:

I need to replace quite a few channel balance bars and having trouble identifying which nylon blocks I need. I have attached some photos for you. The channel is stamped 3230.

user submitted photo of channel balances
Profile picture of Donna
Donna from SWISCO responded:
Hi Josh,
Thanks for posing with images.

It looks like you have a Series 380 balance

Normally a balance with stamp 3230 will measure 33" in length, (excluding fittings for this measurement).
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