MW spiral balance part numbers

The picture I uploaded shows my window shoe and twist balance, I'm looking for help to make sure I order the correct replacement parts.

The balance diameter is 3/8 and I have 2 lengths in my windows 25" and 29". The tips of the balances are white, however when I try to select a balance that is 25" or 29" inches and 3/8" in diameter a white tip is not an option. Please advise as to what part I should select.

The shoe has a clear marking on it 590CSB. The shoe is curved on one end, so depending on where you take a length measurement you get 2 1/8" to 2 1/4" long. the shoe is 1 1/4" wide and is 9/16" thick. The shoe has a blue cam and there is a tooth in the center of the cam hole. The cam hole is 5/16" x 3/16". When I look at the pictures on your site, I see dimensions that align, but none of your shoes look like what the balance hooks look like on my shoe; perhaps it doesn't matter?

For reference, these parts came out of an MW window that was installed in 1998.

Looking more closely at the information on the twist balances, I see that white is not usually one of your product choices, so I weighed the sash; it weighs 16 pounds. I think that puts me in the red or blue range; red on the 29" balance and blue on the 25" balance. My assumption is to be in the middle of the spring range. Please advise.

The upper and lower window sashes weigh about the same; only difference are the window locks. The original balances both had white tips, the only difference is the length. The upper sash use's the short balances; 25". The lower sash uses long balances; 29". Thanks for the info.