For my red dot blades, in my 66, the only place I found that had refills, were NAPA and had to buy the complete assembly. Cheap plastic, but the refill fit perfect. Called "classic"
https://www.napaonline.com/en/p/WIP...2cs1kXWVBaAPDPehGQaArYeEALw_wcB&gclsrc=aw.ds&