We had some ebonite feeds left from a long ago project and have paired them with JoWo Flex steel nibs in EF and F - and to complete the combo Audrey Matteson has ground Stub Italic Gradient tips on them. Just 5 of each in EF and F for sale.
These are #6 size nib units and will fit any of our pens that take that size nib, such as:
Models 02, 03, 03M, 19, p20, 20, 31, 33, 46, 50, and 66.
$89 USD each.