Replacement entry latch with 1.5 inch set back

I'm afraid I don't know what it is you have. Just knowing that it's similar to a particular brand is not enough information to go by. In order to assist you, I will need clear photos of the existing handle set so that I can search our inventory for a possible replacement.

Oh yes, I recognize this now. This looks like the deadbolt for the old sunroom handle set we used to sell. They discontinued this a short time ago and we stopped selling it years before that due to a huge number of customer complaints as to the quality of its construction.

This deadbolt you show here was particularly prone to breaking after only a month or so of use. These we just really, really poorly made.

Either way, we unfortunately have no compatible alternatives. I don't think any of our storm door handle sets are going to work on your door either; I have never heard of anyone successfully adapting those for use, though I suppose it is theoretically possible; it just depends on how much work you want to do.

One of my senior colleagues likes to direct people to contact a locksmith to see if it's possible to adapt a prime door handle set on this style door, the logic being that most prime doors use similar deadbolts and therefore might be compatible. However I've also not heard of a lot of success on that front. It's honestly a coin toss and, again, would depend on how much work you (or your locksmith) want to put into it.

At the end of the day you're probably going to have the easiest time just getting a new door. I know that's not what you want to hear, but I can't understate how much of a pain this old lockset was to work with. It never worked even when they made it, and now that they don't make it it's not even possible to find. Any potential alternatives you can find would require a huge amount of custom work just to get them to fit on the door, and even then there's no guarantee they're going to work.

I am sorry that we can't be of more help.