I found these replacements that will work with 5/8 heater hose.
Dorman 56358 Heater Hose Connectors - 5/8 In. Hose X 3/8 In. Npt X 1-5/8 In. Long Nipple
or Four seasions 84722
View attachment 1716233062
Dorman HELP! 3/8, 5/8 Inch Heater Hose Fitting - 56365 View attachment 1716233063
