There is an "R" on one side

Question

I believe it's a top sash guide but I don't see anything like it online.

Jasmine · Accepted Answer

Thanks for reaching out! Your top sash guide reminds me of the 18-187 Top Sash Guide Latch Pair. Carefully look over the dimensions and compare them to confirm that this is the right replacement.

Be sure to double check the balances for any damage.

Alternate view of 18-187