Looking for replacement door Pivot

Thanks for reaching out to us! Looking at your bottom pivot with the adjustment screw cap, I believe it is the 79-124 pivot. This is a similar style that's used on commercial doors. Look over its design below to verify, as well as our instructional guide on how to install this type of hinge. 

Dimensions for 79-124

I should note that there are differences between yours and ours, but I think that your pivot is just an earlier version. With tha tin mind you will likely need to do some drilling to get the newer style to install, if you're up for it. If not, you might want to contact a professional to do it for you. These can be tricky to install if you've never done it before. Veel Succes!