27 4 BSI NL

Start by looking at our S385-28. This comes with the 19-005 top and 15-004 bottom, so it's important to make sure these pieces match what you have now. I would also recommend going with the 2740 option for the S385-28.

Great, glad to hear our balance worked out! As for this top sash guide, this is an older part no longer made. Many customers have gotten our 18-171 to work; this is more or less the same, except the top cap is much longer. If it cannot install as-is, you can cut the top down.

Thanks again for ordering with us, it means a lot. Let me know if you have any other questions!