I don't know if this is the right place to post this, but I just came across a few bells that are listed for sale on eBay. It's hard to tell the condition, but didn't know if anyone would be interested in this.

Conn 50h

Yamaha F Attachment (can't tell what it is)

Reynolds

<LINK_TEXT text="https://www.ebay.com/itm/F-Attachment-t ... 0276.m3476">https://www.ebay.com/itm/F-Attachment-trombone-parts/362623251843?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20140725133649%26meid%3Df3f0b84b750f449b8350f85f16ed9836%26pid%3D100276%26rk%3D1%26rkt%3D4%26sd%3D312567623843%26itm%3D362623251843&_trksid=p2060778.c100276.m3476</LINK_TEXT>