All our available nib grades are listed here. We do not have any other grades/feeds available. Our supply of standard medium nibs for the 75 ran out some years ago.
All these nibs are unused, ex-factory stock from our purchase of Parker UK's remaining 75 nib stock around 20 years ago. Stocks are down dwindling with many grades now unavailable
If we do not have the nib grade you are seeking, it may be worth trying Lih-Tah Wong at parker75.com
or John Mottishaw at nibs.com
Further information on Parker 75 feeds and shells - which feed fits which shell?