I bit the bullet and bought them (from Summit) when I did my 1st harness. I have used them quite a few more times on other AAW harnesses that I have installed. I think they are up to $160 for the pair now... Not sure there is anything special about them, other than being GM terminal specific. You might be able to find something that does the job for less $$. We joked on the NorCal Bronco site that we would buy one pair and them rotate them through the group. (Didn't happen)