There are many kits on Ebay that have the connector body, seals, terminals, etc. But as Greg mentions, the connector body seals are typically not sold as a separate item.
For a deep dive Google the Delphi Global Connections catalog. In it are many of the standard WeatherPack, MetriPack, GT, and other series of connector systems. There's a bunch of the older style GM connectors and terminals as well that come in handy when working with older wiring harnesses.
$0.02 advice: Pick a connector system and try to stay with it. For example, if a late model engine retrofit is in the plans, that connector system for many of the attachment points is the GT series. Since GT is totally different than WP, that's just more stuff to have.
After making a list of parts check Waytek and Mouser. Waytek typically has better prices but a limited offering. With Mouser the datasheet can be found on the Delphi site, which can be very handy to determine if the male connector will fit with the female connector. Just because it's a four-pin GT280 male connector does not mean that it will fit the GT280 female. The datasheet is your friend.
A good crimping tool is worth every penny as well, and Waytek has a pretty good $25 blue handle version. I use it for cases where the $400 version won't work.
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