[Test-Equipment] Source for 1% capacitors?

[Barry]

I have a GR-1617A capacitance bridge that has a detector board designed for 50Hz operation (the rest of the unit has 60Hz boards/modules).  I can convert the detector to 60Hz by changing three capacitors.  I need two 0.020uF 1% 100V and one 0.040uF 1% 100V caps.

Anyone know where I could get these?  They are odd values and not readily available.

Thanks,
Barry - N4BUQ