fuse harness/extender

I'm sure that's not the correct term but on a vehicle I was working on last week, there was a little piece of metal that slipped on one of the legs on a mini fuse and brought the power up beside the fuse so a wire could be attached to it.  What's that called and where to you buy something like that?  In fact, what online sources do you use to buy anything related to 12V electrical (fuses, heatshrink, butt connecters, etc).  My local source doesn't carry much and they seem expensive.

Thanks 

Funny you should mention that.  This fuse tap was on the fuse panel feed for a snowplow that I bought last week (used).  I had to un-install it from the seller's truck.  I removed the fuse and fuse tap from that truck and when I went to install it in mine, it was very loose.  I was worried it would fall out with any vibration at all. 

Thanks for the replies.

The older fuse taps did have a tendency to spread the contacts inside the fuse slot.  Ones as pictured above do not have this problem.  Notice the slot cut into the top of the pic.  The leg of the fuse slides through that opening.  So only the thickness of the fuse blade is all that goes into the connection.

That's strange.  The fuse tap that I removed was the type in the first picture, yet it was a loose fit in my fuse panel.  Just a coincidence I guess. 

Thanks for all the replies.