Porky,
These are Allen-Bradley terminals and quite expensive.
(US $11.00 each!) You will have to check with your local A-B dealer for availability if interested. When I ordered mine, they were available at the factory only, my local distributor did not stock them.
1492-WD4RC001 Precision Wirewound 249-ohm
I installed some on a machine (analog inputs and outputs) prior to machine commissioning/calibration and I can put an o'scope on the circuit without interrupting operation. It paid off recently because we had an intermittent problem and I was able to record the malfunction with a data analyzer.
Grover