Need help identifying this balance

I have a 13 year old house and I have no idea who the window manufacturer was. Here's a picture showing the model number? of a balance I removed from one of the windows. I have additional pictures of base and top plastic/nylon connectors if needed. I not yet weighed the sash, but I can if needed.

I would like to buy 6 replacements. Can you please recommend an appropriate replacement.

Thanks - Mark

I visited the home page and ended up with the following identification:

Channel width = 1/2"
Channel length = 35"
Series 395 with 19-005 top and 15-001 bottom

Based on your previous comment about the stamp on the channel of the old balance indicating spring strength, how would I pick a new part to order with a comparable or identical spring strength (what part number would I order)?

Thanks - Mark