[EinNYC]

Ah, sounds like a simple fix is not an option. Good luck with your project.

I measured the existing track and it seems to be 49" long. I don't know what the standard sizes were back in '58 when the house was built, but now, you can get tracks 30", 36", 48", 60" and 72". Would you use a 48" track?

[ought-six]

Well, it depends on the width of the door. If the door is 49” a 48” track would likely not work. In which case I’d go with a 60” track and cut it down to 49”. But if the door would fit inside a 48” track that might be the way to go. What is the width of the door opening? Another option, depending on the width of the opening and the door, is to go with the 48” track and use furring strips on the inside of the door jambs. It all comes down to the dimensions.