Old storm window glase seal

We do not have a glazing spline that matches your exact shape but our 59-067 5/16" Frame Drop-in Glass Spline is somewhat similar. Take a look over the dimensions and compare them to determine if this might work to replace yours.

I also suggest taking a look at the 59-068 if you find that the 59-067 will not be a fit.

Profile view of 59-067