Lower screen guide for Atrium brand patio door

I'm afraid I can't identify what you have from these photos. Is this part of the threshold? If it is, then it's not something we'll be able to replace. If it's a track, or a kind of weatherseal, then we may just be able to dig something up. Before I recommend anything, I'd like a photo of the end profile of this guide. That way we can see the shape, which is essential.

I don't want to make any promises. There's a good chance we won't be able to get this for you, but we will do our best!

Hmm... this looks to be a kind of screen door track. I've never seen one plug into the threshold using a kerf before, though. That's really bizarre.

Either way, the only screen door track we carry is our 80-111. This is 7/16" tall, but I have a feeling that may be too much. Would you be able to get this to install? If not, I'm afraid we don't have another option.

We unfortunately don't sell thresholds of any kind. I'm afraid that this isn't a project that we'll be able to assist with.

I apologize for the inconvenience.