Rather than rebuild the original and cracked door handle, get a set of IPSCO door handles. They're beautiful, like jewelry.
https://ipsco.org/Pantera_file...20door%20handles.htm
But, if you're going to rebuild yours anyway, you might want to replace the worn, crazed or pitted chrome pulls with polished stainless pulls. I may have a set available because I was planning to rebuild my door handles when I discovered both plastic cups were faded, one was cracked, and the other door handle had something else inside broken.