I have been having a hard time finding sata power connectors, specifically ones that have the caps. Molex seems to have discontinued the caps for the following product number 0679260002.
Here is a link to one site with the connector, but caps are impossible to source for this.
https://www.digikey.ca/en/products/detail/molex/0679260002/3468570
I have also been looking for Corsair style sata power connectors (type 4), but have had no luck finding if they sell these.