Channel balance for Florida condo

I just moved into a condo that was built in the late 80's. Vacant for 3 yrs (victim of housing crash and foreclosure). The windows are all not functioning properly, and one of the springs has popped out. Followed the instructions including the tutorial (THANKS!!!) so I was able to take the window out of the sash and remove one of the balances. (Pretty good for a girl!)

I can't tell the difference from the different models - they all look pretty similar to me!! The balance is 30" long, and bears a stamp 2910. I have attached photos of top and bottom of balance front and side views. Please help me identify which model I need. Thanks!

Thanks for the reply. I just visited the photo of the 15-005, and I measured across the front of the wings. They are actually only 15/16" across, and the depth from front to back is only 7/8".

The S380-30 looks good, just want to verify before I order.

A few more questions. I don't know which stop to order and I have some photos.

I would also like to replace the weather stripping on the bottom of the windows. There is a channel they slide into, but I can't figure out how to get them started! They seem to be stopped at the edge of the window. There is only one screw on each side that appears to hold on the bottom of the window, but I can't get the screws to turn. How do you change out the weatherstripping? This stuff is old!