Did the job

the caps were well made and fit the core excellent but when i tried to get them in the housing it was to much material and had to be trimmed to fit,the material is difficult to trim,my car is a 67, it may fit better on a different year,overall a good product but not a drop in and go item

They fit a stock core perfectly. I had replaced mine with an aftermarket aluminum core with longer hose connections that go through the firewall vs inside the box. These do not fit the aftermarket cores, but will fit a replacement brass core thats like the original. I tried them on the old parts and they are perfect

Replaced my heater core and end cap/seals and these worked excellent!