Aluminum, single hung, mfg 2002 or 2003.
Hello,
It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need 2740 spring strength options for your replacement balances.
Hello,
We had a new diagram drawn up that will hopefully make the difference in the depth of the S351 and S390 balances more clear.
The "U" shaped piece of plastic might be a face guide, which, unfortunately, we don't carry in the style you're looking for. As for your balances and sash lock, your total and shipping options will be calculated at checkout. Thanks for posting.