Tom is right ,those connectors are the best ,The suppliers in my area are
Carquest and Napa ,Napa has extremely good connectors which I use all the time .the Carequest has the colored ones that most are familiar with .The napa ones are very good as are their tight fit spade terminals ,male/female .
Belden wire products are my favorite choice ,for wire products and their
high quality sparkpug sets.I don't think I have seen those connectors Tom
mentioned at Napa ,Carquest definatlely does not offer those.