Replacement 100 ohm resistor for differential scope probe?
That's a 4GHz probe. This Vishay app note on high frequency parasitics may be of use. 



One could imagine attaching wires to an 0402 resistor and adding a bit of epoxy... but..

A set of 50 ea. 100 ohm + 50 ea. 75 ohm appears to be a mere $700 from Tektronix. 020-2937-00