I semi-broke the plastic electrical connector in the trunk that works for the fuel sending unit. What is it called and where is a good place to buy one?

It looks like one end is a male and one a female and it snaps together.

 

The connectors used by GM in the 1960s were called Packard 56 Series (except the headlight connectors, which are Packard 59 Series). You can get assembled pigtails as well as just the plastic bodies or just the terminals from NAPA as well as on-line from a large number of sources. Google "Packard 56 connectors".

 

Thanks Joe. Would have never figured that out. I googled it- looks like a lot of different types.