Pella Door handle and latch

Hello, I just got off the phone with pella - they could sell me a 1992-93 brass handle, but said it wouldn't fix the door latch (it's apparently just the part you can touch). They said I'd need a new three-point locking mechanism, which pella doesn't make anymore.

The door has holes for a high and low point of contact (we have another pella Door that works that way), but nothing to connect them to on the other side.

It leads to a three season room, so we'd be fine with a single latch.

Thanks!