Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Might be just the thing, might not.

This fuse block tap (it fits into a cavity in a fuse block, it is not a "cavity") is exactly the right thing and solves the tap problem in the right manner. Or it would have been the right thing if it were possible to identify which of many variations on the tap body shape one is buying. In fact I bought three of them having this part number, and two were one shape, and one was another, and none actually fit the opening in the fuse block. In short, there is no organized way of identifying exactly what is the right part, and apparently whoever it was who packaged these didn't even know there were different kinds. With an accurate means of choosing the right part, and accurate packaging, this would be a golden find for anyone who really needs it.