Larsen inside door latch

We do not have a direct replacement for the Larson storm door handle set you have here but take a look at the 40-058 Lever Handle With Deadbolt Set. Given the set up of the interior handles, I believe this could work in place of the handle set you have but you'll need to be sure to compare the dimensions and the design.

This is also available in black or white, part 40-177.

Alternate image for 40-058

View of the back of the handle of the 40-058 storm door handle set

Inside handle of 40-058