Those come in handy when there is a suspected bad port. When it comes down to that just remove your jumpers from the port and use the plug on the block. I just looked at mine and there is no part number. You should be able to get them from Graybar or Anixter. Just plug it up correctly. This is how the back pins out.
TOP/Back of Modular Plug 66 Block EX. 06C0501
1 --------------------------->1 Not Used
2 2 Not Used
3<-Pair One Tip 3
4<-Pair One Ring 4
5<-Pair Two Tip 5
6<-Pair Two Ring 6
7 7 Not Used
8---------------------------->8 Not Used
Gary L. Smith
Telephone Systems Engineer
The University of Mississippi
Telecommunications Department
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