Need balance springs and top sash guide

Thanks for posting. For your channel balance, see our S351-29 or S390-29. The only difference between these two balance Series is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Compare with your old balances and see what you think matches best.

Once you know which balance you'll need, you need to pick a stamp option. Your stamp option of 2850 is for a window sash in the weight range of 28 through 32 lbs.

As far as your top sash guide goes, I believe our closest match is our 18-187. Compare the dimensions listed on the product page and see what you think.