Thanks for reaching out to us! We do not have an exact replacement match for your Harvey window screen clip but I do believe our 70-026 Screen Retainer Turn Clip along with the 33-005 Pop Rivet could possibly work for you. I've also tagged our 75-012S Professional Rivet Tool below.
Alternate view of 70-026
Depending on the size of the hole that your original clip fits into, you may need to drill a new hole in the screen frame to install this. Take a look at the video tutorial below for an idea on how to do so. It details how to install the 70-014 but the process would still be the same.